How is your boat balanced? When wide open, or close to wide open trimmed up where does the spray come off the sides?
I got a "fast one". After break in with everything just as it came from Tracker I got a max gps speed of 37.9 mph. (Tracker estimates top speed to be 32-35 mph)
I added storage, tackle, changed trolling motors, went to a bigger gas tank and went to lithium batteries. After than I could "maybe" get 36 mph in excellent conditions. Also, it was almost a different boat when the tank was full. Basically I had added weight to the front, and removed weight from the rear. When on plane, trimmed up the spray off the sides came from a little in front of my feet. It also rode a little bit lower on the starboard side. I usually fish alone so my weight as well as the console created an imbalance. During all of this I ended up with a used SS prop, the same pitch as my original aluminum one. I "think" the prop gave me a little better hole shot but that's about it. My boat rode rough. When the water was rough the ride was also wet. As an experiment with my electronics I installed a Group 27 lead acid battery in the port side rear to separate my cranking and electronics batteries. It didn't have any effect on my electronics, but it turned my boat into a different boat. When planed and trimmed the spray is even with the back to my seat. It's also balanced better side to side. The ride is smoother in rough water, and I rarely get wet now. Top speed? I recorded 41.1 mph but it was 30 degrees with a tail wind. That was at 6100 rpm. In normal, and calm weather I can get 38 anytime, occasionally hitting 39. (@ 5900 rpm). I cruise around 30 mph just under 5000 rpm now. I no longer have the battery connected, but won't remove it. It turned my tub into a different boat. I've since added 20 pounds under the passenger seat. The side to side balance is good when I'm alone. When someone is with me I either swap sides with the 20 pounds, or take it out.
IIRC you have your batteries, or at least some of them toward the bow. See where the spray comes from next time out. I suspect you're riding with the bow low, basically plowing, instead of getting on top of the water.
I've never had a 4 blade prop, or even a fast boat. My last boat was 20 horsepower tiller steer.
I need to add. Keith mentioned motor performance. A while back I was cruising around 30 mph. A guy I see at the landing with the same model boat I have passed me and was waving like "come on". I throttled down, trimmed up and passed him back. When we got to the landing he was amazed. He had changed the ECM and removed an intake restrictor on his 50 horsepower to make it a 60 but I was still able to pass him. We popped his cowl off and inspected his throttle. He wasn't getting anywhere near full throttle. The next week he passed me, and drove away.
Added screen shot from Navionics app to show my real top speed. (I thought it was 41.1, it was 41.3) If lake conditions permit I'll make a speed run for a few miles this weekend. Top speed will probably be low to mid 38 range with normal weather.