Think the turbos maxed out
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I don't think the turbo is your problem, I think the pump needs to be tuned better. Either that, or the popoff on your injectors is out of whack. Happens sometimes with new injectors, they're great out of the box but once they break in the bar pressure is off. Regardless, I ran the stock turbo with more or less the same setup but bigger injectors and no plate, and was normally a couple hundred degrees cooler at those speeds. If anything I should have been hotter. Only other significant difference is my timing, which is part of the tuning I'm talking about. Bump it up into the 15-16 range, tighten up the AFC a little and see how that goes. I was regularly pushing over 40psi out of my stock turbo for years (probably well over 100K miles) and EGTs were never a problem.