Scotty, from what I've been told fitting a stage 2 valve body will slightly decrease the oil temp, but you would probable not even notice the difference on a gauge.
From the sound of it your heat issues have been an issue for a while, can u confirm this, also has it been like that since you have had the car / fitted the gauge?
What is the temp anyway?
Stage 2 does make gear changes between 1st and 2nd quicker and stops flares etc so not a waste of money, definitely something wrong there mate, esp as the tc is not locking up anymore
Time is never wasted when your wasted all the time 
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