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And the net results thus far (eventually I get bored)

After some great tips from @Hooyaah, and the pleasure of reading these adventures, I discovered (and I'm likely not the first but I couldn't find mention of it) this, which I have dubbed "The Turtle of Certainty". Simply align your Assailing Somersault onto the turtle when it's somewhat past the boat, being careful not to attempt any further movement, and you'll find yourself outside the map- every single time. If there's mention of this turtle and I've missed it, all credit to the original poster and many thanks and apologies. Happy hunting!