You need to know what the manufacturers recommended RPM range is for your engine. Does this prop run in that range? If it is below or at minimum you probably need an inch or 2 less pitch. SS props can be repitched at a prop shop. Not sure about aluminum. Aluminum does flex some on start so they act like a lower pitch out of the hole. SS is better all the way around unless you hit things. Then they damage lower unit parts.
