L31MaxExpress
I'm Awesome
Yes I added 5oz to the accumulator and so I was accounting for 9oz of fresh oil plus 2oz of oil left in the rear ac lines and rear evaporator to bring it to a total of around 11oz. But now I have 15oz in there and my gauge pressures are at 70/250 in 90 degree ambient temperature.
Can all of the extra oil be the reason why I can't get the low pressure side anywhere near 40psi?
Extra oil is not good. It blocks heat transfer to some extent and compressors do not like compressing liquid. That being said pressures should not be that far off with a few ounces too much oil.
To purge excess oil, I would consider doing the Sanden oil test. Run the compressor at the specified RPM. Recover the refrigerant. Remove the compressor. Drain the compressor of oil into a clean measured container. Measure the correct volume of oil accounting for the residual oil in the compressor specified in the Sanden manual. Then add back the specified amount for the RPM it was run at. Mine has right at 11 oz in it.