Using VREF pins for pots that don't reach ADC=0 or 255

[Demon]

whether your pot is 4.7k or 5.2k should make zero difference , an adc reading of a pot is ratio metric
if both pots are at 50% reading is vdd/2 no matter what the resistance is

I set at 200ohm on multimeter to get more accurate reading:

left pin to wiper = 2.5R
right pin to wiper = 2.6R
left to right = 4K7

It doesn't go all the way down to 0, or up to 5K.

ADC readings for this pot are 2 - 254 (I had removed 2 bottom bits).


EDIT: I was using 20K setting for all readings before.