The adjustment should be set at 10k ohms for most if not all the chips you will be programming. I have mine set at 10k and it works perfectly. That setting was mentioned on the RCD site I believe in the questions and answers section in one paragraph, so I followed that suggestion and it has been working.

You are right, the addition of the parts you mentioned are the only differences between 2.2 and 2.3 versions.
I hope this info is of some help to you.


John