Well that's a novel problem!! Sounds like one of two things. Don't laugh, but check your gauge hookup, try a different gauge. High side of 150psi is a tad low. I don't know how to interpret low pressure being above red on gauge. What is the low side PSI reading? If low side is as high as you say then you might have overcharged the system. How quickly is the compressor cycling? Is it making any funny noises? If low side remains high after correcting the amount of charge, then the compressor is not giving you enough suction. I hope you didn't put in any of that stop leak stuff. The worst case scenario is that both high and low are equal (bad expansion valve, orifice tube). Many possibilities here..
1987 BMW 325