heating up a little more

Based on what? He didn't include enough information for a plug recommendation. You would need static and really dynamic compression numbers for that.

Bob, you didn't include how hot it's running now and when it runs as hot as it does. Idling? Driving down the road? Throw us some bones here.

Did you read what Bob already did? It doesn’t really matter what his engine specs are. The car is running hot. The fact Bobs already spent more then enough money chasing ghosts due to advice its time to do something else.