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Unfortunately a big intercooler doesn't always mean better...this is the case with the Edelbrock.
These cooling systems require finding the best balance (compromise) between pressure drop and airflow distribution to ensure intercooler effectiveness.
The Edelbrock has a large flat core - the larger and thinner the core is the more difficult it is to drive distribution and make use of the core. From the testing that we performed, the Ebrock has a low pressure drop across the cooler, but along with that a low effectiveness - resulting in the high outlet temperatures at high RPM. This isn't noticed at low pressure ratios, but become more apparent at higher pressure ratio (and at your altitude you're running a lot of pressure ratio).
Months of performance stand testing and multiple iterations were required to get the Maggie 2650 intercoolers system to perform at the same capability of the TVS2650 rotating group (The Maggie 2650 was the last to market). As ZL1Atlanta eluded to in his post, no matter how hard he pushed the Maggie 2650 it was able to stay in line temperature wise, that isn't a coincidence, it is as designed.
Porting the Ebrock can bring the flow capability of the unit up to par with the Maggie 2650, but it doesn't do anything to address the cooling issues with the unit. It's overall a good unit, but just at a slightly different level than the Maggie so comparisons will always yield the same result.
Fortunately if you can run full E85, you probably have nothing to worry about - the manifold temps you're referring to shouldn't be a problem with adequate octane fuel. Remember with a positive displacement SC (unlike a turbo or centrifugal), will not provide a significant increase in power with lower manifold air temperatures unless you are knock limited and reducing timing. The only way to make a positive displacement SC to move more air is to spin it faster or reduce SC inlet pressure drop - the PD supercharger completely dominates the airflow capability of the engine.
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