There will be a trace in order for the the 7660SCPAZ to work correctly!
It's the only one I use & have recommended others that have had issues with the TC1044S with the same issue you had here.
The only advantage the LT1054 is it can handle up to 15v input & double to around 28v + -.
You should see a trace either top or bottom of the pcb going straight from Pin 1 to Pin 8 or with the power unplugged & IC removed, test for Continuity.
My last order included 10 CIC ROHS 3PDT Blue footswitches that I have been using for years but this lot had dodgy threads & you couldn't tighten the nut without it jumping threads which reported here on the Forum.
I contacted them & they new about the Issue & sent 10 more that were a newer...
I believe it's R8- 39K on the Sproing, 10K on the Deluxe!
The lower you go, The more spacial it gets!
I settled on 25K on my Sproing & it sounds Great!
You could use a Trimit PCB with a 50k Trimmer & you can set where you want