Should power be put into punches and blocks? From what I've seen in aikido, punches and blocks are like a dance - no power. You couldn't block a real punch. Or execute a real punch.
Upper punch, punch up - above my head (not at it) and I'll simulate a block. Gimme a break!
Aikido punches are for setting up uke/nage period. Don't fool yourselves.
Do what you do best ... don't punch! Or train for it.