Took another look today and sure enough it had a txv on the evaporator. I added a small amount of refrigerant to try and get to 10 degrees subcooling. Getting about a 15 degree split out of the evaporator.
Superheat at the outdoor unit really doesn't tell you much. You should measure it as close to the evaporator as possible.
Yep, there's quite a difference on mine. About a 6° rise in line temp from evap to compressor. Figuring in pressure drop that gives me about a 7° difference in SH. It's about 103° outside right now and my line set runs through the attic.