A/C Compressor does not cycle on/off.

I replaced the A/C compressor after the first one froze up. I replaced the dessicant in the Condenser, but not the expansion valve. I did use a vacuum pump on the system for an hour, and it seemed to hold up for 20 mins. My wife, who drives the car says the cooling is about 80% of its normal operation.

The main problem is that the compressor does not cycle on/off. I initially poured 4.25 oz. Of pag oil, per instructions. Then I attempted to put 15.88 oz of refrigerant into the system, as required. I lost count because of suspected gauge leaks or other (perhaps due to ineptness on my part). After, a couple of attempts, I used a simple store kit on the low side to fill one can of refrigerant R134a and a portion of a second one to approximate the 16 oz. Needed. The gauge was showing a reading of 30-37 after that. The high side was showing upwards of 150-250 pressure on a hot Florida day.

The Check Engine Light has been on for a while now, but did not see any faulty issues come up when I connected an Actron scanner to the car.

Any suggestions?