Hi I have a 2007 Mercury optimax 150, SN 1B459138. Under light acceleration 1200-1500rpm I notice the temp will sometimes creep up to the 160-170degree range at which time I put in neutral and it will drop down to around 140-148degrees. On plane I have no issues, pressure is around 10-12psi and temp around 98-100degrees. Is this normal? I feel that it’s on the high side. Water pump is new, pee stream is strong, and all temp readings are coming from the smart craft gauge. To my knowledge the t stats have never been replace but correct me if I’m wrong those only come into play at idle from what I’ve researched.