Mark, props now to try on your GT-150 are an OMC cleaver, an OMC 2-blade bronze, or possibly a Ballistic 21".
Soon I will be trying 5 props - 2 - 22" Rakers, 2 - 23" SRXs, and the 21" 2-blade bronze.
Do not expect the 2-blade bronze to be as fast as the other props, as it does not have the rake to lift the bow needed to go fast on the CVX hull.