Vegas charger assuming your temp guage is correct that reading is rather unusual since most jets "struggle' to get off the cold peg on the guage and routinely run 100 to 130 Even with a by pass T stat kit they usually have a hard time maintining 150 160 .I think your on the right track looking for restrictions etc also there should NOT be a T stat in this boat Unless it has a 4 outlet T stat set up with bypass Call me I'll be happy to help you diagnose and toubleshoot this
Tom 805 466 4719