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I would expect 29 -30 mph in smoother water. Hard to say in extremely rough water, I wouldn't want to run at top speed in a 22 ft. pontoon in extremely rough water. Benningtons and your etech are very well built and should handle the conditions if driven reasonably.
You shouldn't have a problem with flexing, but I think you may get some spray. The front fence on the FSi is open at the top and the windshield is small.