Thank you for pointing out the incorrect wiring. I discovered the same thing yesterday afternoon. With the correct wiring the top end is higher but still exhibits the slow rotation when the motor should be off.
Is there a chip that has the higher voltage rating? Is this a function of the chip being controlled by a 5.5V source? I saw some that say they can go to 16.5V but move to the 14 leg style chip. Something like the AD5291 Analog Devices DigiPots
My bigger issue is I need to be able to stop the motor. Any ideas on why it would not be stopping on the low end? After looking at the data sheet it looks like the wiper has a minimum resistance of 75Ω (while i was measuring last night about 100Ω) I am thinking this could be the cause of the small bleed off that is causing the motor to slowly rotate. Is there a solution to mitigate the minimum resistance from POW to POB?
Thank you for your help!