Hmm that is new to me on the __pc fields, I have never seen that before

Maybe it is something new

I think that the connection settings using the Enterprise are harder to learn and have never had use for it. My company also has the enterprise version

If you have it working then stick with it

The partner client can pick up all your custom fields and field types.... try this simple script on your localhost or server and let me know if it works okay

I will list out all your objects and fields, no matter if they are custom or not