I have a 2018 blazer SS 1752 .80 gauge hull. Originally had a 60/40 and it ran 30/31 mph. I beefed up the transom and hung a 115/80 on it. Running on fumes by myself and minimal gear in the boat, 39.1 mph gps is my max speed trimmed out almost sucking air. Assuming I replaced the impeller, wear...