This wasn’t meant to be a confrontational post dude. If you’re happy with and confident in your coverage, that’s all that matters.
To answer your direct question, no, I do not have any personal experience with an insurance claim on an overpowered boat. Nor do I know anyone who does. I also don’t know that many people who have overpowered a boat.
I have seen, as you have, scores of people, a good number of whom *claim* to be insurance adjusters, accident investigators, lawyers, etc. (I have not independently verified their credentials) who all say the same thing, that if an investigation into an insurance claim reveals that the vessel was overpowered, that *can*, not necessarily will, be grounds for denial of coverage.
What I’ve never seen, is anybody claiming to be one of these individuals saying that overpowering a boat is totally fine and not an issue.
Another aspect here is that per long-understanding of maritime law, it is the responsibility of the owner/operator/Master of a vessel to ensure that it is maintained, equipped and operated in a seaworthy manner. Which doesn’t emplicitly STATE, but certainly IMPLIES, that it’s not the insurance company’s responsibility to verify that your vessel is seaworthy- it’s your responsibility to ensure that it is. Many a commercial insurance claim has been denied due to a vessel that was properly insured being deemed unseaworthy during an investigation- by nature of overloading, poor maintenance, improper manning, or many other factors.
As an experiment, why don’t you try calling your insurance company and specifically asking “hey, my boat carries more horsepower than my capacity plate allows. Am I covered?” If you’re not comfortable doing this, maybe ask yourself why that is.
At the end of the day, I’ve never met an insurance company that I trusted to decide things my way when there was a gray area… how confident are you that yours will?