I would probably say my first serve percentage is around 50-60%.
I think the post above is right sometimes I really do think that the ball most likely isn't going to come back. I think the 1-2 punch and serve/volley is what I need to practice more.
I usually have no problem hitting the ball after the first return on my second serve because I have a lot more time to get back into position and I don't jump in as much.
and thanks for the reply on OP the only term I know for OP is from gaming and it means over powering. xD