I'm getting AK AQ AJ KQ KJ QJ AT etc busted far too often because I get way too many callers preflop. Here is my standard play:

FOr AK AQ and AJs I raise 4x bb to .40 cents. Usually about 1-2 callers.
For AJ and AT I raise 3.5x BB. Usually about 1-3 callers.
For KQ KJ and TT I raise 3x bb to .30. About 2-4 callers.
For QJ and 99 I raise 2.5x bb to .25. Everyone calls.

Any tips on which overcard hands I could raise preflop better with?

EDIT: I should know that I play at 6 person tables. I heard this is way better than 8 or 10 people tables.