Cooling system help needed

[bmwillia]

By the way, I do have two water pumps rebuilt by skip.

I really don't know that I am overheating until too much of the coolant comes out for the remaining coolant to keep the engine cool.

What you all are saying about flow makes sense though, could it be that there is enough restriction in the radiator that when running at higher RPM with Skips higher flow pumps that the water cannot move through the radiator fast enough and therefore backs up and out of the cap?