Some plastic materials deform at relatively low temperatures. Yes, you may be able to fix it. Radio Frequency Interference (RF IF) is a tough one, most gain pedals like Fuzzes and even some wahs have a lot of RF problems. There are various positions in regards to a buffer’s use in a signal chain.
The pickup and volume knob become part of the fuzz circuit. Then laying out and building one pedal takes a very long time, as does testing it to make sure it works. The best power supply available is from Digital Music (Voodoo labs). It has eight isolated power outputs so your effects will not have any problems no matter what the polarities are. They should be spray cleaned on the wiper area with some electronic spray cleaner/lubricant. Jacks should also be cleaned with a Q-tip.
Would it be possible to get the the brown mod done on my original TS-808? Would it make a difference? Also each active component generates noise which also adds up. I have one buffer (a delay pedal with a nice buffer when off) at the end of my pedalboard to send the signal to my amp on the rare occasion that I have no other pedals turned on. They usually start with 137 which is the manufacturer (137 = CTS), then the next digits are the year and week.