92 f150 ac problem

I have a 92 f-150 300 6cyl with factory a/c. Just flushed system out, replaced orifice and drier, and recharged. low side gauge shows 100 psi/high side shows 210psi. At idle, blows warm air. Higher the rpms, the colder the air gets. Can anyone help me determine what's wrong? Running r-12 still, and think its compressor, because at higher rpm, low side drops to about 60. Not overcharged, only used 42 ounces of r-12(recommended for this vehicle). need to find problem. Really hot in Louisiana. Thanks

Have you checked the condensor to be sure it is clean? Sounds to me like the condensor is either plugged with dirt, or plugged internally.

i flushed out the entire system. everything seemed to flow through nicely. Other than that, I don't know how else to check the condensor. Thanks.

Do you have a fan clutch? If it is not operating properly, this may cause the concern where the condensor is not cooling properlly. Also use a water hose to clean all the debris from the cooling fins of condensor.