Vmax 150 cuts out on top end..please help!!!

[DEEP-DIVER]

I Have model V150TLRZ and im having problems getting boat past 50mph.It takes of strong and runs strong up until 45-50mph and it just stalls.You have to back off throttle a little then it will kick back in but continues to cut out in that same mph range.sometimes less,sometimes a little more.I have changed primer bulb and hose,spark plugs and ran 2 cans of seafoam through it,but nothing has changed.Does aanyone know what may be causing this and what part i may need?I DONT have the money just to let a mechanic keep throwing parts at it until its fixed.I apprecriate any help....Thanks

[rodbolt17]

need RPM numbers.
MPH is teats on a boar hog.
my bet is going to be lack of fuel in the fuel bowls.