you are right, the numbers are close. I did not know the rev limiters were set at 6000 on your motors. Did you have that done? As far as I knew the limit is 6400 or so. This would explain a lot. I think you have to have the limiters reset to 6400 to begin dialing in the boat. I think the 100 pounds in the bow is way too much. The most we ever ran in the 28' Skater was 35 pounds in each sponson, and that was only when the water really got bad. Your boat is bigger then the 28' Skater, and should not need any weight except on the very bad days. Our Skater had the 5" set backs also, and the attitude can easily be adjusted with the engine trim. Please forgive me, but do you have a lot of time in the boat yet? most people that do not always think the boats are too light in the bow, but don't worry, It will be fine without any weight. There are quite a few 30' Spec's ( very similiar to your boat) running here in NJ with 300's and I don't think anyone is running weight in the bow. Get the weight out, and get the limiters up to 6400 and see what the true speed is. As far as the 14'5' props, lets see what the 15x34's do.