"When it cycles on the presure goes from 82 to 58 then rises to around 65 then a bigsurge down to the off cycle pressure."

Hmmm.. quote buttons didn't work. No matter. In saturated temperatures, you have "It goes from 36 deg F to 22 deg F then rises to around 26 deg F then a big surge to the off cycle. This would make a wonderful Professor Sporlan or Fridgetech challenge. Not moisture, because you can force it to run and achieve temperature. I have to assume if you are achieving temperature and not mentioning that you short cycle, that the compressor is not badly sized.

What on earth is a big surge to the off cycle? Forcing it to run makes everything work okay? What is the time-line? A graph of temps and pressures would likely tell the story. We risk a bad observation on your part, Ken. But nonetheless,

Nice puzzle!