My boat is limited to about 1500-2000 RPM when WOT. I cleaned the carbs, have new gas, good compression in each cylinder, but my spark is weak on cylinders 1 and 3. Cylinder 2 is strong for some reason. I changed the ignition coils to cylinder 2, and all work good. I changed the power pack ($500 mistake), retested the spark and basically same condition. The pulser coil has in spec resistance and voltage. The charge coil has in spec resistance but low voltage (about 14 volts at 1000 RPM when it should be around 120 volts per the Yamaha service manual). Should I replace the charge coil? What else could it be?