If the pots don’t work well, then note that the wiring diagram shows the ‘ground’ tab on the pots folded back and touching the pot casing but there’s no red blob indicating they should be soldered. Those folded back tabs should all be soldered to the pot casing. Either directly, or using a piece of wire. There should be a wire connected to ground going to the back of each pot. Not all pots have tabs that are long enough to bend back to reach the pot casing, so I generally use some wire to connect them regardless.