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The compression is too low for it to run correctly. The bare minimum is 90 PSI on all 6. This could just be a carbon issue due to the towing. You can try and get a can of Mercury PowerTune from your local dealer. Remove all 6 plugs. Tilt the engine us some and shoot the PowerTune into all 6 cylinders. Allow it to sit over night. The next day, trim the engine down, have a towel or rags under it as the stuff will run out of the exhaust. Turn the engine over with a 15/16" socket to force the PowrTune out of the cylinders. After that, do another compression test. If all 6 are now above 90 PSI, go out and run the engine hard to get rid of the rest of the carbon. You may also want to replace the plugs.
The compression on a new engine is close to 120. On a used one, I look for at least 90 PSI on each cylinder. Doing the process that I explained MAY get the engine back onto specs. That really depends on how the cylinder walls themselves are. If they are scored from either a lack of oil or from getting hot, you would be looking at either a rebuild or a new powerhead. The PowerTune is always my first step in the shop to try and get a motor back to where I need the compression to be to make it run better.
For the fuel filter, send me the serial number and I will get you a diagram of it.
Yes you can get back to me. I am also sending you a phone offer if you wish to get me on the phone while you work on the engine.
Part 10 is the filter.
Sea Foam will not do the trick here. You should be able to get it at a Bass Pro.