I Never Lead into a Preflop Raiser

[CruNKinTILT]

Vs certain players, I can understand leading combo draws and sets can be the most +EV way to play them.

But what else can I lead? I feel that after a while, better players know that you are only leading hands that have value and start playing against it more easily. i.e. just calling your flop lead and using superior position - when you could have gotten more money into the pot by using a c/r.

I guess what I'm asking is what kind of hands you can "balance" leading with in order to be more unpredictable.

FWIW, in the last 53k hands I've played at NL 50, 100, and 200, I cannot remember one time I led into a preflop raiser (Though mostly at NL 100). I am a solid 5bb/100 winner and I'm starting to wonder if it's a BIG LEAK to only use a c/c or c/r on the flop in this situation.