I actually run under 700*F EGT on a WOR (wide open rack) run under full load for a mile. On the other hand I'm not at all sure my engine is making full power (working on that). I have good compression and have run from 14 to 20 PSI boost pressure.
In other words I don't have a clue on your issue. I do run a conventional thermostat (no idea of the brand) and a 3 core Chevy big truck radiator. My guess is that elevation is not helping your situation and a big radiator never hurts - I'd install that aluminum unit and go back to a regular thermostat.
Dan
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