When I got my new Alumacraft Yukon 165CS/50 Merc EFI, it also threw huge amounts of spray on-plane. The motor was mounted as low as it could go and that was the problem. The anticavitation plate was throwing that spray up into the air, because the plate was buried in the water. Once I raised the motor (1 hole in my case), the spray pattern became more normal.
If you're getting 34 mph and 6250 rpm, you are under-propped for the load you had. Raising the motor will increase WOT rpm. Consider moving to a 13 or 14 pitch prop after you raise the motor. I run a 13 on my 50 horse, good for 6000 rpm with just me and a normal fishing load in the boat.
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