So...
Button OFF means Potentiometer value = 0
Button ON means Potentiometer value = 14 (no turn of the dial, this is base value)
Then when dial is turned up to maximum (where the value is obtained from the serial monitor) 255, it reads between 248-251. Never obtaining the max value of 255
The analogValue /4 can happen or you can map it, same difference.
@groundFungus will do give me a moment. Best i can do is wire it up in Tinkercad and show you a diagram that way. Would that suffice?