the 275 on the high side is prob responsible for the 50-55 on low side.there is no diff btwn 134 and r12 expansion valves.you need to check that aux fan turning correctly,main engine fan clutch is locking up.assume you vacuumed well before charging.what did you flush system with?all you have said leads me to believe that you don't have enough condensing.either air flow dirty condensor,crushed fins or perhaps dirt between cond and radiator.one other possibility is the fresh air door closing completely?[behind glovebox].
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