It blows constant 42 degrees at idle, never cycles. I drive on highway the comressor kicks off after 2 miles for about 10 seconds, then back on. Acts like high side cut off. I always assumed with more airflow (highway speeds) the high side presure goes down so I cant see how the high side could be kicking it out. But how can you tell as I cant have gauged hooked up on highway....

 

I agree that it is probably the high side kicking off your a/c. The faster your engine goes, the faster the compressor goes. Easy solution though. Google a R134 ambeient temperature chart and remove some 134 until you reach the proper pressure.