In combat powers, procs only have one chance to activate
In toggles/autos, it's one chance every 10 seconds
Far as I can see, it's WAI. Personally, I'd take out the procs and slot it up for more damage/recharge. You want at least 95% enhanced damage and 85% enhanced recharge. Ideally, 95% for both. A good way I've found is slotting 4 Thunderstrike, 1 dam/end/recharge from any set and 1 proc into Burst and Slug, the +acc should be enough when combined with Tactics for FA to be slotted for 3 dam 3 rech (on a budget build, if you've no Tactics then replace one dam with an acc/dam IO).
I am the Blaster, I have filled the role of Tank, Controller and Defender
Sometimes all at once.
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To expand on what CBeet said, just because the DoT for full auto extends over several seconds, that doesn't mean the proc gets multiple chances to fire.
The way this stuff works is that procs are based off of power *activation*, not the actual effects of the power. This is why, for example, a proc from a KB set in a power that only has a chance for knock can still go off even if the target mob is not knockbacked, or the achilles' heel proc can activate in a dual pistols attack even if you're using an alternate ammo which turns off the defense debuff effect.
So, when you use full auto, the game basically says 'oh, he's activated this power. It hit... this many targets. It will apply... these effects to those targets. Ooh, it has a proc, make a roll for each target... it hit this many. etc, etc'. It doesn't actually care that full auto does a DoT, so having a DoT doesn't give it more chances to activate.
This is slightly more complicated for toggle or auto powers, since those essentially 'activate' several times a second while they're on. *Here* is where a DoT effect would have given a proc a chance to activate on each tic - i.e. rain of fire actually summons a psuedopet that uses a fast-ticking auto power to apply the damage, so if procs worked the same way in these powers it would proc tons. *However*, since this would be pretty absurdly powerful, the devs instituted the ten second rule for procs in these sorts of powers - a proc in a toggle/auto will only check once every 10 seconds at maximum, so either way a DoT will never give a proc chance on each tick.
@MuonNeutrino
Student, Gamer, Altaholic, and future Astronomer.
This is what it means to be a tank!
Thank you. I've removed the procs and have the recharge at a fairly good level.
Just a couple more questions about AR ( been a long time since I've played this toon ).
Both flamethrower and ignite seem somewhat underpowered. It's a rare occasion when they hits more than 3 or 4 mobs. It seems like back in I4, flamethrower used to be quit damaging... Do I need to slot these for more accuracy, or are they just underwhelming powers?
I find myself using mostly full auto, m80 grenade, buckshot and slug. The others seem fairly useless.
131430 Starfare: First Contact
178774 Tales of Croatoa: A Rose By Any Other Name ( 2009 MA Best In-Canon Arc ) ( 2009 Player Awards - Best Serious Arc )
Ignite is a bit hard to use effectively. The fire patch it spawns is only 8 foot in diameter (*not* radius!), so with the flee effect enemies tend to run out of it quickly. I find it's best used either right at your feet to convince enemies to run out of melee with you, or if you can get the baddie immobilized/held. It's definitely a limited use tool - although if you *can* keep an enemy in the patch, it does do a good amount of damage and can help make up for AR's otherwise lackluster ST output.
Flamethrower, on the other hand, is a great bread-and-butter attack for the set; I'm not sure why you'd be having so much trouble with it. The cone is the same length as buckshot and 50% wider (45 degrees instead of 30), so if you're able to get decent coverage with buckshot you should be more than able to do the same with flamethrower. It does more than twice as much damage as either buckshot or m30, and has a 30% accuracy bonus on top of all that. It does cost a lot of end and take a while to recharge, but it's definitely worth it. About the only reason I can think for it to seem lackluster is that it does do that damage spread out in 8 small chunks over 7 seconds, so you might just not be seeing how *much* damage it actually does, especially if you're laying in with other AoEs at the same time. But it's definitely a staple attack, and one that I'd never skip.
@MuonNeutrino
Student, Gamer, Altaholic, and future Astronomer.
This is what it means to be a tank!
I think I slot posi, minus proc, and an acc/rech. And it'll be really hard to slot Thunderstrike in Full Auto. Really hard.
Flamethrower seems like no fun, but the DoT helps. I use Firebreath on my fire/ blaster and it gets some good damage going. But in fire/ the two heavy hitters are blaze and fireball.
I only recently started running Herostats and am amazed at what it shows as far as my good attacks. Sometimes you never realize what's actually doing the most damage, like in my fire/rad controller, what's doing the most damage is "not me." 
Make sure to put range, if possible, on your short attacks like buckshot and flamethrower.
Given the long duration and number of targets that it usually hits, I thought Full Auto would be a prime candidate for proc enhancements. So, I had it slotted with 5 Posi Blasts ( including the proc ) and the Javalin Volley proc.
What I thought I would get:
1. A chance for it to proc more than once, given the long duration of the power.
2. The proc would hit multiple mobs.
What I'm seeing:
1. The procs occurs only once. ( when it occurs )
2. The proc hits one and only one mob.
Has anyone else tried this? Is this working as intended, or a bug? Given what it's doing, I'm thinking of losing both procs and just slotting for recharge.
Edit: Ok, went back this morning and took a closer look at the combat logs. Occasionally, I'll see 3 or 4 procs per application, but the number of procs still seems a bit disappointing.
131430 Starfare: First Contact
178774 Tales of Croatoa: A Rose By Any Other Name ( 2009 MA Best In-Canon Arc ) ( 2009 Player Awards - Best Serious Arc )