What is your engine? "current prop is giving me the WOT rpms" is very Vague. Where within the WOT range is it running?
It is difficult to make comparisons of between brands of prop, or even between different models/lines within a brand. Your are currently running a viper, which is a slightly, very slightly, tweaked version of the original OMC SS line. If you want a 4 blade with the same blade shape as the Viper, your best chance of that is from BRP.