Time to Fix It Right
Thanks for the feedback, all. I agree those numbers are quite low. However, they're not THAT much lower than when I ran this test 7/8 years ago with a threaded type tester from AutoZone. Those were in the 110-115 range.
Anyhow, I will try again with a loaner screw-in type and see if things look any different. Want to get this step right before moving on to any other plans.