Slightly nose heavy is better than slightly tail heavy. But more than "slightly" of either can lead to a broken plane. I totally agree that moving the CG back can do wonders for slowing down your approach speed.

Looking at your other planes, though, you should keep in mind that a Zero is going to land faster than any of those, no matter where the CG is. You'll definatly want to get up high and do some test stalls and slow flight practice to see what it does.