Its gotta be something blocked.

I verified it was pulling vacuum because I pushed a screwdriver on the shrader valve, and it had suction, so the system is EMPTY. Now, why does 20oz of 134a (effectively 3/5ths of the required amount) make the pressures shoot through the roof. The system STILL needs another full 12oz, but there is no way it can take it.

Could the expansion valve be plugged or open maybe?

I don't want to start evacuating everything again unless we are sure its the condenser. Or I guess a foolproof method is to flush both evaporator, condenser and replace TXV?

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