Tiny margin between VFR cruise and over Class C? Our class C airspace at KRDU has a 4400 ceiling. If I fly Westbound above the airspace at VFR cruise, I'm expected to be at 4500. Since this is a tiny margin and I don't want to bust into the airspace by accident, do some pilots fudge on the cruise altitude and create a larger margin for themselves, flying at say 4600? I'm a lower hour pilot and while that's no excuse to bust minimums, just asking what you all think. Yes yes, flying at 6500 is also an option but this was a rather short XC scenario, plus let's assume a cloud layer at say around 6000MSL. :-)
I had a similar situation flying over the Class C at Albuquerque New Mexico.  Albuquerque's Class C goes up to 9,400 and I was flying VFR at 9,500.  In this case I was using flight following going from Las Cruces NM to Santa Fe NM and was handed off to Albuquerque Approach.  Albuquerque Approach simply told me to notify them if I needed to make any altitude changes to remain VFR.

I think most pilots would simply call Approach in this situation and let them know they are flying over their airspace.  You would need to know the correct altimeter setting anyway to make sure you are at the right altitude.