New to the whole straight razor experience. I've got a new razor and strop, but before I start using them I wanted to get decent at stropping using a dull edge straight razor and a cheap leather strop - figured it would help me with the motion / technique before I started to shave. Sometimes I think I'm doing ok, but I notice that my thumb and forefinger start creeping up the shank towards the blade as I do multiple passes on the strop. I'm thinking maybe it's the way I'm holding / flipping the razor. Any tips or suggestions would be greatly appreciated.

Thanks