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The numbers vary according to ambient temp, but mine with a rebuilt compressor & new drier showed about 28 on the low side, 215 on the high at 2000rpm - I think it was about 80F outside.
Given you got at least 2 oz of oil (and the right kind) in the system before turning over the compressor, I would guess it's the expansion valve - of course my guesses almost always are wrong. It's a real PITA to get to the expansion valve and the whole system has to be pulled down, etc. You don't mention high side pressure - that's a good thing to know. Is there a considerable temp difference between the low pressure side hose near the compressor and the hose outlet from the evaporator - should be able to tell by touch? Have you tried spraying a fine mist on the condensor (you only want enough water to cause evaporative cooling)? There's other cheap tests before going to the dealer, lbut all the other tests I can think of at the moment need a high pressure side reading.
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