Ok. Going to give an overview of what all that's been tested and symptoms.
Symptoms: Erratic tach readings, no top end power or speed, motor seems to surge as I attempt to reach WOT. Boat used to run mid-60s mph and I'm only achieving 47mph tops. First hole shot is good, but after motor gets warm, it really struggles to plane out, if it does plane out.
Findings: Compression between 100-125 on all cylinders, stator is in good condition, plugs are firing when cold(did a drop test and all plugs affected motor equally), can be intermittent once motor has been ran a short while, checked to see if prop had a hub slipping, was not the problem. I have changed plugs and checked gap. Carbs are clean and jets are clear. Fuel is good and so is fuel pressure.
With this, I'm thinking voltage regulator or power pack(maybe both)... Any suggestions?