70 Still getting hot, what else to look for?

How old is the water pump and is it a high flow pump. Starting with the simple things first, pull the thermostat and make sure it's opening at 175-180 degF. Bowl of water on the stove with an accurate thermometer and it doesn't matter if its new or not, I had a brand new one fail last year and if it's not a high flow thermo. replace it with one that is.

Terry