Check out a Supro Delta King 12 if you can.
If you want simplicity the Fender Pro Jr is a great choice.
Just to mess with him would duplicate one of his late 1960s rigs such as '60s Telecaster or SG Junior
with 100 watt Marshall Head or Twin Reverb, 4x12 slant cabinet and last but not least an Echoplex. :p
You could try a .033 or .039 uf cap and be in between in values but still have a decent usable span on the tone control.
Mylar film capacitors are very good and usually very close tolerance or exact value.
Sounds like something circuit wise is not right especially when you mention taking the tone pot out of the circuit.
Best to review all that. If you have Heartbreaker Bella Noire pickups those are more vintage and not hot output
so don't think if those are an issue.
I have 4-ways on 8...
Neil - mainly Gretsch
Steven - some Gretsch, Guild Duane Eddy DE-400, either Gibson L-5 or a Super 400(?). 3 pickup Gibson Les Paul Custom
Uno Mundo and Questions sound very much like archtop or semi hollow ones.
He used an Esquire later with CSNY.
I leave them on stored if at home or out to play if.....case or bag isn't going to be around a lot of heat.
Straps are mainly 100% cotton except the leather ends. No poly or nylon as those can react with guitar finishes
especially in warm to hot areas.