I'm still running the Mishimoto radiator cap and I doubt it is the problem because the system is still holding pressure. This is apparent from the bulging upper hoses when running hot and the rad cap feels solid when tightening it down, but it's worth a shot with another cap to see if that is the issue.
I will try running without the t-stat installed and see what happens then. I'm also going to boil test the t-stat and make it is opening properly.
I'll keep you guys posted, thanks again for all of your suggestions.
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