Chris,
Sorry about your tuner jack issues. With the tuner jack plugged into an amp and while you play guitar through the pedal, can you get the signal jump in and out while you wiggle the male jack that’s plugged into the tuner jack (up and down and left and right)? I’m just wanting to see if there might be a bad connection in the jack. Other than that all i can think of is that there might be a bad solder connection somewhere in that signal path…check J5.
Let me know.
-Brach