Our lake has weird boat restrictions. We bought the biggest we could - an 18' SLX with a Yamaha T9.9LPB engine. It's perfectly fine for us and it gets up to around 7mph (lol) but it never gets past 2200rpm. Reading online specs tells me this engine should be around 5000-6000RPM... Should I be worried? We only have around 9 hours on it so far.