[chumbucket]

Like I told you over the phone. Stop fixating on the temp problem! Worry about that later. The sputtering of the motor is not related to the motor running hot at low RPMs. The sputtering, bogging, cutting out (whatever you want to call it) only happened at higher RPMs when the motor is running at it's coolest. The problem never materialized at trolling speeds. You either have a fuel problem with the pump or something in the the carbs like a blocked jet. If not, then it's electrical.
For all your worrying about the higher temps at trolling speed, that motor ran at trolling speed for close to five hours and never once missed a beat. Worry about the other problem first. One thing at a time.