Since my first post, I have reduced the POT to 50K and I've used the code example given in the PBP book to adjust the scale and my value is now set to 30 so this is a mystery but I am not so concerned.
I will use 2 diodes to supply the PIC and run the motor off the 6V, anyway the goal is to reduce the motor speed so it will be set to probably half duty-cycle. I didn't receive the motor yet but fingers crossed.

Thank you Henrik for your help.

Mike