If the real issue is usage driven heat then changing the valve to Maxton is probably not going to solve the problem.
A cooler can help but only if there is sufficient temp difference between the oil and the air.
The best product that i have seen to eliminate heat issues is a Blain EV4. it is a VVVF controlled motor and pump that eliminates the control valves in the UP direction and by doing so most of the heat generation. I have seen it take cars that were shutting down a couple of times a month due to heat issues to no shutdown for almost 2 years.