Anyone had any problems using this product? I had a fouling problem in a 115 Yamaha 4 stroke once...was told it was a mismatched prop...but never bought that.... I had used Stabil...My engine would top out at 5500RPMs....happened after a day of trolling. My new boat has quite a large fuel tank and am wondering if I should use it with my new 225 yamaha when the boat is much less used in the winter. Suggestions?