I think you may be overlooking the obvious here. You removed the A/C system. Have you sealed up the ducting from the grill to the radiator to keep warm air from recirculating back through? The air should be forced to flow through the radiator and down under the car, otherwise it will get hot under the hood and not cool the engine effectively.
I think the rear mounted radiators will do little other than show off your ability to fabricate. As Frank said, many mid engine cars have front mount radiators. My MR2 was like this as it was a better system in spite of all the plumbing issues it created.
Speaking of fabricating stuff, any more info on your Ultragauge setup? That's pretty slick. How do you access the buttons?
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