Looks like your WOT range is 5150 to 5850.
if that's true, you're 400-500 rpm shy of where you want to be
What diameter is that 11" prop?
A 4 blade is going to make things worst.
If your go with the rule of thumb, 200=1, you need to drop down to 8 or 9" prop. Don't know that they even make...