She bought an 08 glastron 4.3gl vovlo penta drive. So now I have to learn about boats. LOL. Current prop 14.2x23 with 3 blades. Thinking about going to a 14x21 with 4 blades. To get a better hole shot or to get on plane faster. How many more rpms should I turn at wot? What would I lose in top end? The 3 blade is the stock prop looking at the solas 8613-140-21. Any input would be great Thanks.