89 GT200 johnson has a few wet plugs

[nebraska_woody]

I've been running my motor some and when i check the plugs right after running, the right side(driver side) plugs are all pretty white, dry and clean and in the other bank of cylinders the plugs are considerably more wet and dark from the other half. The motor as last time run has been running rough at idle speed when in the water, but seems to run smoother when it's out of thewater with a hose attachment on it. I've decarbonized the motor (about 4 or 5 applications worth) and cylinders and alot of carbon has been removed from the motor, but what kind of adjustments do I need to make to get all the cylinders firing and burning equally? any help would be appreciated. thanks to all.