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Lawrence,Your running pressure are just a bit on the high side usually meaning you over charged. Heat will cause the pressure to read a bit higher but not affect any cooling if the cooling fans are running. If you place you hand on the low pressure hose ( larger one) at the compressor with the system on and running does it get cold?
If the low side line is not getting cold with the compressor running then you likely have a failed compressor providing your system is not over charged. The pressure reading you have listed are on the high side, normal low side pressure should really not exceed 40 PSI at idle and high side pressure should not exceed 200 to 225 PSI. Dose the pressures drop when you run the engine RPM up at idle?
The first thing you need to do is install a set of gauges and read the pressure at idle and again while you bring the engine RPM up. The pressure should drop as you bring the RPM up and if it does not and there is no cooling then its likely a failing compressor.