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Re: Yanmar still overheating
Make sure your prop is clear. To do this, place the transmission in neutral and increase engine speed, slowly to 3200RPM. If it does not overheat, you need to pull the boat and check for barnacles, prop fouling, etc.
I have the same engine and used Prestone coolant (ethylene glycol based antifreeze), in a 50:50 mixture ( antifreeze : water ) this spring. No problems.
Also, do you have an engine heated water heater? If you do, do you get hot water? If so, your coolant system is probably ok.
Let me know how it turns out.