I have learned a ton of info on props these past couple of weeks. From what I have learned is by just adding the extra blade will give you stern lift such as going from a 3 blade to 4, or a 4 to 5 blade, etc. However when you add rake along with cup it will raise the bow. The Revolution 4 will lift the whole boat because it's a four blade with a good amount of rake and some cup. The problem with a 4 blade is you'll lose a little on the top end because of the extra blade creating extra drag in the water. If you look closely at the Mirage Plus it has a lot of rake and cup which makes it a bow lifting prop. The Bravo I has ran the best so far on my boat because it's a 4 blade with not much rake or cup, it will almost remind you of a cleaver prop.
I don't have room for a 6-71, I wish that I did. I had to already cut 1" off of my flame arrester. Although I bet that I could make a Paxton supercharger work.
At this time I have about reached the limits of the TRS outdrive and the Mercruiser transmission, so I'm going to leave well enough alone.