Replying to Binding position and float?

I have always skied with centermounted bindings on powder and park skis. I have a pair of Bluehouse Maestro 118 wich are almost centermounted and I have never experienced to sink in deep snow! But with my K2 shreditor 112 centermounted I feel like I have no float in the pow... How much better will they float if I mount the bindings in classic stance for example? Or should I have a fatter ski? Anyone else have any experience switching binding positions further back on skis?