Double checking up here.
You really want to be able to track three things.
1. Slice and dice
You can envenom with four or five combo points (cp).
Once you can see all three of those things easily (I use powerauras) then you are close. Get snd up with the first cp you get. Get rupture up with the next cp you get. Get an envenom to extend your snd and get you the buff for applying poisons. Now that you have all three rolling:
No matter what cps you have, is rupture rolling? No. The use whatever you currently have to get rupture going again. Yes, move on.
Rupture is rolling, is snd about to fall off? Yes, use what you have to envenom and keep snd going. No, move on.
Do you have four or five cps? No, mut. Yes, move on.
You have four or five cps, do you have the envenom buff? Yes, pool energy but DO NOT cap. No, envenom.
So there may be time that you do nothing to pool energy because the important stuff is covered. Your main dmg comes from instant poison on main hand, melée, then deadly on off-hand. The buffs of snd and envenom proc'ing more poisons are the real damage. You don't "directly" do more damage by pressing more buttons. Overlapping the envenom buff is wateful unless you are full energy.
PS. Don't forget to switch to backstabbing sub 35% hp.
Not sure your level but that is the end product. Adjust accordingly if you don't have some talents yet.
"he doens't need healing, he doesn't need healing, he doesn't nee-WHAOSHIT!wtf was that man!". Please stop leaning on TDR. -Teng