I read a line that keeps me in line on most par 3's. Maybe it will help you. I, just like yourself, found myself short on many par 3's. And, guess where they put most of the bunkers, grass traps and other potential hazards? Exactly.....
"When addressing a par 3, always hit 5 yards further than what the hole plays. Most hazards are located at the front of the green. Take one more club and swing easier, or make yourself aware that you have to be solid with your selected club to get the ball to the
back of the green. With these thoughts, even a shot that isn't hit 100% will land on the green more often than not."
I tried this, i've been pretty much on every green on par 3's for as long as I've maintained this school of thought.
Try it out. Maybe some of it will rub off on you.
R35