I'm not an expert, but since the replies so far have been along the lines of "You're a fool for trading options," I'll offer my $0.02.
I generally try to manage defined risk trades (like iron condors and call spreads) at 50% of max profit. As soon as I get filled, I calculate what I need to buy it back at to get 50%, and enter a GTC order. (I almost always sell premium instead of buying, so I'm buying to close.)
For undefined risk trades, like straddles and strangles, I'm happy with 25% due to the greater risk and higher premium received.
If it blows through my strikes with some time left, I just hang on and hope. I almost never adjust a defined risk trade... I don't necessarily think it's a terrible idea in theory, but the few times I've tried it, I would have been better off leaving it alone. Of course, undefined risk trades are different and you have to constantly be ready to adjust them.