Pedal popping fixes??

Good evening,
I've used 3 different PCB manufacturers so far and I seem to encounter engagement popping with the majority of my PedalPCB builds (Modus Operandi, Transcendence, Arche, Shrapnel, Guardian, Magnetron, Spirit Box, Duocast, Ocelot, etc...). The circuits sound fantastic once they're on, but engaging a pedal in the middle of a song, and hearing that pop, is a bit of a nuisance.
I searched through some of the posts and I see that a 100k resistor on the output is a common fix - as well as switching to tantalum on some of the electrolytic caps.
Question is, "where is the best place to place the 100k resistor from output to ground?" Should I put it on the footswitch PCB? Do I need to go directly from the output pad on the main board?
Thanks for any help you kind folks can offer? I'm asking here because I'm not experiencing this issue with other PCB manufacturers. On some of the problematic builds, I've tried 3 different brands of 3PDT footswitch, soldered transistors instead of socketing them, put on some additional RPD, etc... I'm wondering if I'm building all of these pedal incorrectly. Thanks again. (Pic is the latest build - Guardian)
IMG_6118.JPG
 
Much more tolerable... This pedal will be part of my base tone - and I think I can get away with the minimal pop. Thank you.
I'm Happy there was an improvement but I would still try a 1uf Tantalum Cap at C11!
Make sure you fit with correct Polarity!

I built this pedal with 9 & 18V Toggle switch power & it's Quiet when Footswitch is used!

I would look at using name brand like Nichicon or Rubycon or Worth Electrolytics in your builds!
 
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