It's probably a bit early for anyone to comment on 3.1 imp performance at level cap. By the time you reach 80 I'm sure there will be plenty of data available. In the meantime, I don't see how your post contributes to a thread that is entirely about endgame discussion, since it's basically a "help me make a leveling spec" post.
The above is my warlock's data sheet.
I plan to stay deep destro regardless of 40/31 being the higher spec and 'feeling more' destro than deep destro itself. My question/statement regards the new imp changes and the corresponding talents required to boost the little guy to being the dmg dealer he now is.
I'm not sure how useful Demonic Power is. My imp goes oom on standard target dummy testing within 2 lifetaps of my own spellcasting. Knowing that how fast he casts has no bearing on how much damage he does over the long haul, I plan to drop 2 points into Destructive Reach and Shadowburn instead.
My question is if this imp going oom senario plays out at cap like i'm noticing for leveling? If so, this will confirm my choice for another burst dps choice and reduced threat.