How much are you raising PF with hands you can be reasonable sure you're ahead on like Ax, Kx.

I do a:
SB: 3xBB
BB vs SB/D limp: 4xBB

Is this reasonable or too little? I think it may be on the small side. I raise a bit less from the D figure I can outmaneuver them on the flop, though this may sound irration now that I think about it...thoughts?