I rebuilt mine but adjusting it makes little difference to the pressures. I got it down to 47# (spec is 30#) but that's all it'll do. I'm using Envirosafe and the pressures should actually be lower than R12 or R134a specs but it's not happening.
System is blowing mid-high 40s air. Maybe I'm expecting too much? I'm used to getting low 40s output.
I added a 16" Spal pusher fan to the condenser too.