I let it seep until it was just barely coming out, and then buttoned it up. Car was absolutely level. I even double checked with a level on the door sill and pinch seam to make sure since I was getting nervous.
I never could feel it with my finger at all...which is what was making me nervous. Still not totally comfortable with it, but if it was still seeping out after cleaning the hole and threads with a rag...it had to have been full.
Working on diff now...