Here's a thread that discusses some of the math that Serrate held my hand through (thanks! 
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http://boards.cityofheroes.com/showthread.php?t=136877
Esentially, the proc will tack-on 100% (for scrappers) to base (unenhanced) damage for 5 seconds. This has has a 1/20 chance (5%) of happening each time you hit your power-up, rolls for the 1 in 20 every 10 seconds in a toggle- like invincibility, and, the best use of it, will have a 1 in 20 chance for powers like follow-up and blinding faint.
So... calculate your attack string for your power-up time and try to front load the first 5 seconds for your 1 in 20 gamble... 
. Try to calculate its benefit by multiplying the additional damage by 0.05 to take into account the gamble, and, if placed in an attack compare that value to another proc, or benefits of using something other than this proc.
The only time it really works out, IMO, is in follow up, blinding faint, and soul drain because they are used so frequently and SD hits so many.
Miss Arc #147491: Rise of Bedlam
AKA Iron Smoke @Champion Server
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It's not a bug (well, not in the sense that you're assuming it is). It's actually an issue with the buff procs acting the same as toggles via the UI to determine whether they're active or inactive. In order for it to act properly, the Mids UI would need to be tweaked to have a completely different button to toggle on and off buff procs.|
Originally Posted by Ghost_Ripper
Bug in Mid's.
It reads the chance for build up (+100% damage) on your Gaussian as a flat out bonus where it only goes off at a 5% chance (and hence should only apply 5% as the average damage bonus). |
Also, it wouldn't really be 5% of the bonus because Mids' isn't set up to have different proc values for toggles/passives and activated powers (which would be even more complicated because they're got variable uptimes and therefore variable contributions). The contribution would actually be 2.625% +dam, rather than 5%, because the buff only lasts 5.25 seconds but the proc will check only once every 10 seconds (re: uptime of 52.5%).
As to getting better value out of placing the proc into powers such as BF, FU, and SD, that depends entirely upon what you're aiming for. Many people use the proc only to gain that sweet 6 piece Gaussian's set bonus. Putting the full Gaussian's into FU, BF, or SD is largely a waste because FU and BU are attacks and should be slotted as such and Gaussian's doesn't provide redcap +rech nor does it provide any +acc which Soul Drain needs because it has to hit in order to apply the buff. The Gaussian's proc doesn't really grant as much to a build as the 6 piece set bonus as far as I'm concerned, so I would rather slot to optimize the use of the set overall rather than a single, rather insignificant, damage buff.
So given the option between putting a build up proc in an ability, would you put it in focus or follow up?
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Focus, for 2 big reasons. The first is that there aren't any other ranged set procs that contribute damage unless you go with the Gladiator's Javelin proc so it's the best of a bunch of rather mediocre options. The second is that you're not preventing yourself from accessing the Gaussian's 6 piece by slotting the Decimation proc.|
Originally Posted by Negescape
So given the option between putting a build up proc in an ability, would you put it in focus or follow up?
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Of course, if you don't ever plan on even trying for the Gaussian's 6 piece and have a free slot available to put into either Focus or FU, then you'd want to put it into FU because then you'd be getting higher damage/DPA attacks being affected by the buff for a larger effect overall.
You must slot it in follow-up as this is the only power you gave that has the option of slotting for to-hit buffs. This is not an attack IO; it a to-hit set enh. There is a ranged damage proc (i think in the decimation set) that could be used. But, like Guassian's, the set is worth more than the IO most of the time. I do use it in flares on my fire/mm blaster as kind of a ranged "jab" mostly out of fun- never crunched the numbers.
***oops mis-read the post, stick with Umbral's responce***
Miss Arc #147491: Rise of Bedlam
AKA Iron Smoke @Champion Server
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Both of the BU procs are unique, which also means that the 6 piece set bonus for that particular set is also going to be unique (all of the other pieces are as slottable as you want them). Considering the 6 piece set bonus for Decimation (1.58% +res(tox/psi)), I wouldn't consider slotting the Decimation proc alone to be at all a hindrance or even at much cost (woo... losing a tiny bit of potential +res to two rare damage types), especially consider the low level and thereby lower enhancement values of the Decimation set overall.
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Originally Posted by Kractis_Sky
There is a ranged damage proc (i think in the decimation set) that could be used. But, like Guassian's, the set is worth more than the IO most of the time.
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I went with "yes."
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Originally Posted by Negescape
So given the option between putting a build up proc in an ability, would you put it in focus or follow up?
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Be well, people of CoH.
I'm guessing that since Mids has no qualms with slotting both the GSFC and the Decimation versions that it's a viable option in game?
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Correct. As per my last post, I use both. The Gaussian CFBU in Followup and the Decimation CFBU in Focus.|
Originally Posted by Negescape
I'm guessing that since Mids has no qualms with slotting both the GSFC and the Decimation versions that it's a viable option in game?
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Edit: And the Achilles' CFDRD in Slash.
Be well, people of CoH.
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Mine is set up the same way. Over time (in AV fights) it does increase your damage output, but if you don't fight anything that resilient it may not be worth it for you.
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Originally Posted by Bill Z Bubba
Correct. As per my last post, I use both. The Gaussian CFBU in Followup and the Decimation CFBU in Focus.
Edit: And the Achilles' CFDRD in Slash. |
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Originally Posted by Dechs Kaison See, it's gems like these that make me check Claws' post history every once in a while to make sure I haven't missed anything good lately. |
Heck yeah, man, do it. With db/sr build with 208% global rech (3 stacked BF), I have achille's heel in AB, Fury of Gladiator in Sweeping Strike and the Gaus Proc in BF. the highest NON-critical hit Ive seen was 646 with sweeping strike with all procs on an even (lvl50) deathmage. Gets to be like gambling, tho: 0.4 x 0.4 x 0.05 = .008 (less than 1% of all procs happening in the 5.25sec window (and still with possible missing, so dont hold your breath)). I do have 24.5% global damage bonus. Great for big hp things, and the -rez helps on teams, too.
Miss Arc #147491: Rise of Bedlam
AKA Iron Smoke @Champion Server
Bug in Mid's.
It reads the chance for build up (+100% damage) on your Gaussian as a flat out bonus where it only goes off at a 5% chance (and hence should only apply 5% as the average damage bonus).
I was told this in another thread, and I was wondering how do you then figure out what damage you should be doing then if you do hit that 5% chance for 100% dmg buff? What would be the average I could figure for dmg buff when using Concentrate which is the power I have it in? My concentrate recharges every 26.2sec. Thanks.