DC on tremolo controls of tremodrive, noisy depth pot.

[Buck112]

Hey, all!
Recently built a Tremodrive as per Ricktone's schematic and wiring diagram. Been dealing with several issues but the current (hehe)  ball buster is...the depth pot. After the  build, there was a sort of electronic "whooshing" that would be audible when the depth pot was rotated. It has grown in volume in the past week, and also makes actual popping sounds now. Full disclosure, circuit is housed in a sesame oil can from work sized to the  box it will eventually live in, and some wire runs are quite long including the leads on the electrolytic across the depth pot. Didn't want to drill the aluminum box until I bad my layout  bug free.
 Here is some info:
all components are new
Depth pot is clean (taken apart,cleaned and dried)
When the depth is at zero, the issue is almost inaudible
When the depth pot is fully engaged, tapping the pots garound wire, the 10 if 50v cap, and the housing of other 2 pots all make wretched popping and scratching noises.
It seems to me that the fluctuation of .5v-2.5v on the cathodes depending on depth setting is normal(seeing as the tremolo is controlled via the cathodes)
When  measuring DC from either grid to ground, all seems normal UNTIL depth pot is rotated. Then there is a random spike anywhere between 5mv-50mv (higher sometimes, if I move the pot back and forth rapidly, it climbs as high as 300mv) this spike correlates with popping and such, but sometimes it makes it's awful presence known when  idle and no controls are  being moved.
Please help! Thanks.

[PRR]

> tapping the pots garound wire, the 10 if 50v cap, and the housing of other 2 pots all make wretched popping and scratching noises.

Bad Connection. "Somewhere".