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Ok since it's not all pcbs with an issue I am now leaning towards a trace whisker close to a through hole pad. Or a manufacturer issue which I have seen on pcbs that I had made.
Weird how that happens.
Unfortunately I don't have the time at present to figure out where it is exactly but if I get to it I will report back.

I really am not looking for an argument as much as a solution.
The basic circuit of the SunKing & KS are the same.
Zero complaints with the Sunking but a bunch with the KS so what is the difference?
Bypass & chargepump/power voltages to ICs being the two differences.

You mention lead dressing possibly being an issue but there are 4 short wiresthere from the board to the switch and they are nowhere near the charge pump so could that really be the issue?

Fwiw, I think the pcbs offered are great and not trying to create a problem that doesn't exist but there is an issue.

To attribute the issue to the tone section kinda makes sense in that it was running at 27 V before and now at 16, give or take?

Going to check to verify voltages again.

Different power schemes between the Sunking and the Kingslayer.

Not digging the Kingslayer and while I haven't completely figured it out I am certain it's more of a power supply issue with changing the gain in the tone section being an easier fix or perhaps a pulldown resistor in parallel to the clipping diodes.

Will keep at it because that is how I am wired....lol

fwiw, the Klon does not have these issues and while a dimed Klon won't sound good I never saw one with oscillation issues like this.

Took a look into the squealing Kingslayer issue and believe I found the solution.  The issue comes from the charge pump. Pins 1 & 8 are connected in this design.
A 10uf connected to pins 1 & 2 stops the squeal for sure but I didn't get to fully test this out.
What this did prove, to me at least, is that it is definitely coming from the charge pump.

I would try seating the charge pump but lifting pin 1 (?) from the socket to see if that removes the squeal.
In any case I convinced the circuit is not quite right as is.