So I've played close to 100 hours on both my ps3 and pc, and I have some technical questions.
If I use dark channel, and then deotnate it with a warp, is the dark channel and power damage increase from warp removed from the target by the explosion?
If I have a power boost mod on a pistol, is it still active even when I'm not using the pistol?
When a banshee stops warping around, why can't I seem to create biotic explosions on it?
What makes phantoms so hard to kill, and what's a good way to get around it?
If I have 200% recharge rate on powers, and then equip a cooldown mod that gives me 5% more cooldown on powers, will I have 205% cooldown or is 200% the cap?
I'm sure I have more, I just can't think of them at the moment.
I know you have some answers already, but more info is always good 
With regards to dark channel/biotics, any DOT/debuff continues for the entire duration of said power, regardless. Priming works for one detonation, then the enemy must be reprimed. Think of priming as a seperate effect, not related to the actual power (other than the evo's that boost BE power/radius and the level of the power, the more points, the more powerful the BE)
Weapon mods only boost you when you're actually holding the weapon. Holstered weapons give no bonuses.
Banshee hand of denial/biotic shield is a visible effect, which can be depleted. It functions very much like your own shields, but without regen. She can only raise her shield with her hand of denial, or her screaming animation (which is often followed by her biotic jumps). This glowy sparkle of doom is also an indicator of when she can sync-kill. No sparkles, it's safe to get in to melee range.
I don't think there is a limit to the percentages on recharge timers, but after a certain point, it becomes obsolete. Experiment by equipping different weight weapons and checking the recharge times in the powers menu. Personally, if there isn't going to be more than half a second difference, there's no point. For example, I believe on the Human adept, all the powers (with no specific evo's for recharge other than the rank 2 one, plus the 200% weapon recharge bonus) come out at 2.54 seconds (IIRC). If you then try and boost that further, you're only going to knock about 0.2 seconds off, which isn't going to make much of a difference!