I have a 21 ft. xs Lightning custom boat 2006, open bow with a 502 chevy marine power with 500 hp. The engine model is a 500x engine. The manual says it should spin 5,200 rpm mine only spins 5,000 rpm at wot. It has a dominator set back pump with a droop, ride plate, place diverter, and a a/b impellor with an inducer, and blue print. The motor also has lightning headers. Is this normal or is somthing not right. Everything is factory set. Before inducer and pump mods it only spun 4,900 rpm. Also having some problems with engine temp never seen it above 115 degree is that normal. One other question does anyone know somewhere that does good gel coat detailing or able to get flaws out of gel around the San Francisco bay area namely east bay or semi close. Any help would be apreciated.