[yorkie_chris]

Can't help with the miss, if it goes away when the powers on then I'd leave it.

As for the full lock thing, have you adjusted the play in the cables properly? Loosening the cables a little so that the grip has 1/8" or so play in it usually gives enough room that it doesn't rev at full lock.
Just give it a little play on the adjusters under the twistgrip.