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Which coolant temp sensor did you replace? There's two of them, a 2-pin and a 1-pin spade connector style. The 1-pin is for your gauge cluster only, the 2-pin is used by the ECU.
Running bad when the engine is warmed up really points to a bad temp sensor.
You should really have a consult cable at this point, and actually monitor what the ECU is seeing. So you can see the code 55 and check TPS voltage with a volt meter, but it's way more useful to see what values the ECU is actually seeing.
Running a T28 at wastegate spring pressure is a waste. The S14/15 used a wastegate solenoid to run that thing at about 11 psi stock, and the S14 came with the same 370cc injectors. You have room for improvement here.
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