The Big Boys will give you more down the line speed. If you just want to lean forward and go they are the way to go.
The new 3 degree fins will cause less down the line speed because of the added drag, but they will make your board have more drive and be more responsive. the 3 Degree fins are like what you see on board like shred stixx and walker project boards, they have cant and toe in, which is a first for inland surfer. This creates much more drive when you pump the board. They will help your rail to rail response and you will get more out of each pump so it sets up for airs better.