Calculating DPS, am I doing it right?

Edit : Oops, looked at my title. Its a little misleading. Sorry about that. XD It should have been "Calculating Recharge Times for Attack Chain"

Ok, I was looking into Arcanatime and looking at examples of calculating recharge needed for DPS and I esentially want to know if I have it figured out.

So, lets look at Dark Melee

Looking at the attacks
Shadow Punch - 1.056 Animation - 3 Second Base Recharge
Smite - 1.188 Animation - 6 Second Base Recharge
Siphon Life - 2.112 Animation - 10 Second Base Recharge
Midnight Grasp - 2.244 Animation - 15 Second Base Recharge

An attack chain of :
Shadow Punch > Smite > Siphon Life > Midnight Grasp

would require recharge reduction of each power by:
54% > 111% > 223% > 344%

Now, if this is correct is the formula:
(base recharge of attack) / (cast times of other attacks) -1 = recharge buff

Does that mean that the percents calculated above already have 100% recharge enhancement through IOs/SOs and that's the global recharge needed or is it that attack chain respectively or does that mean that's the total needed through enhancements and global recharge?

Also, just as an add on questions:

I know that the formula for recharge reduction is:
Base Attribute / ( 1 + Total enhancement amount )

However, how does global recharge effect that? Is it:
Base Attribute / ( 1 + Total enhancement amount + Global Recharge)

or is it something more?

Appreciate the help you masters of DPS you

I have to ask, are you using mids?

I don't actually know how much recharge any perticular attack needs, but when I work on my DPS chains, I know I basically just look at the rechagre times compared to the animations times...for instance with your Dark Melee chain...

Shadow Punch needs to recharge in under 5.544 Seconds (the combined animation times of Smite + Siphon Life + Midnight Grasp).

Smite needs to recharge in under 5.412 Seconds (the combined animation times of the other three attacks).

Siphon Life needs a recharge under 4.488 Seconds.

Midnight Grasp needs a recharge under 4.356 Seconds.

Simple addition.

Now, when making the build, I just keep an eye on what MiDS says for the powers recharge. If it doesn't make that requirement, you need more recharge

Or is there some reason people would need to know the actual "how much recharge in a power do I need" to build for it?

Also, I would think SM -> MG -> SM -> SL -> Repeat would be the easier to obtain attack chain, as your's has MG and SL come up just as often (once per cycle), but need to come back faster due to SP's lower animation time.

Which may not be a big deal, but SM has better DPS than SP.

See I thought I was thinking about it too much. I had noticed others were using some formula when checking there attack chain. I thought it was more then the arcana time formulas XD Oh well, no harm no foul. Thanks for the help