Water and air temp has been real high past 3 weeks. There is a thought. Are engine temps OK? Wonder if your water pump/impeller has lost a flap or two or something blocking cooling. Direct cooling (lake water cools engine), or water/water heat exchanger Lake water cools water/coolant mix?
Take a garden sprayer with you next time and see if cooling anything down helps.
Might try running the blower just to lower under cowling temps.
With FI either pressure isn't being maintained, the rail is getting hot and vapor is forming or the controller thinks temp is lower and adding "cold start" and not warm start fuel.
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