I`ve got a Procraft 1650 aka a 161/2 fter running a 115 pro blend and a 21 pitch SS prop. I fish 3 people alot out of it and fully loaded it gets up and out of the hole great. I hardly ever open it up all the way and it still runs 50 at 4800-5000 with wide open at 5500 running 53-55 with 3 people I think going to a 19 does help with the load but will over rev your motor, thinking it`ll rev 6100 with just you but you know you don`t have to run wide open with it with out a load.