First - I'd call David Force at
RV Cooling Unit Warehouse (901-337-9948) where you purchased the Amish replacement cooling unit for your Norcold 1201 LRM and go over your problems with him. Ask if there's someone in your area knowledgeable and qualified to look at it. I seems from what you're saying, the original installation may not have been up to par.
The other option would be to call the people at Ford Refrigeration, 1746 Big Bear Hwy, Benton, KY 42025 (270-354-9239) -
http://rvrefrigeration.com/ and see if they have a trained representative in your area. Here's a list of some of the graduates from Ford Refrigeration's training program:
http://rvrefrigeration.com/rvtraining/alumni/. You can look through it to see if any of them are close to you.