78 johnson 175 wet plugs only turning 4200 rpm

[Orlando]

78 johnson 175, it bogs when i try to accelerate and will die if i dont pull throttle back most of the time, a couple times it has accelerated properly first try but usually it takes multiple attempts of slowly inching the throttle forward and backing down a hair, then giving it some more. tach works intermittantly and at WOT highest rpms i've seen is 4200. plugs seem to be wet with fuel when pulled. compression is 90 cross the board +/- 2psi. got good spark, jumps 7/16 inch on tester and shocks the hell outa me when i pull wires while it is running. its not overheating, highest temps i've seen with infrared thermometer is about 147. carbs are all opening closing properly,and are synched per my manual. not leaking out the fronts when primer ball is squeezed. checked bowl drain holes on carbs, seem to be pumping decent amount of fuel from all three.previous owner said he had them rebuilt last winter. fuel tank vent lines have been cleaned. have tried portable tank with no difference. its got the proper champion ul77v plugs, no gap to these to worry about. i've ran about 120gallons of fresh fuel through it since ive owned it and its been acting this way the entire time. power packs check out. im out of ideas on this one, did alot of looking here and on iboats to find a solution. just out of ideas, i know its not over propped has factory omc 15x17 aluminum. any thoughts suggestions or ideas would be greatly appreciated