Your performance calc. has already, in theory, accounted for the conditions. Don't get creative. Fly at V2 plus any extra that you've already achieved within the scope of your a/c manual. If all that you have is V2, then fly at that speed. Trying to accelerate now will almost certainly require level flight. Not a good idea.
Rule number 1 is fly the a/c. If you aren't successful with that the rest doesn't matter. The earliest time to do your recall items is 400 feet. That doesn't mean you have to do them then.