Are you making these tests while the pedal power is off or on?
In your re-flowing the solder joints something must have changed…most likely something was shorted. Make sure that the pins of C17 aren’t shorted. You may just want to try it out with a guitar to see if signal isn’t making it’s way through while the effect circuitry is bypassed.
It seems like there may be several different issues that are causing these problems (or possibly inconsistent/intermittent test results). In cases like this we need to eliminate each potential issue in hierarchical order. The issue at the top of the list is your meter. You probably should wait until you get a trustworthy meter that can give you good results before you continue. I’ve used a few old radio shack meters before and from my experience they aren’t very reliable.
-Brach