That's kind of what I was thinking too. I've had a tester read low in the past too. Maybe tomorrow morning I'll try to get in touch with the company selling that clip again and see if they can retest the first few cylinders. An 8psi difference seemed pretty promising to me. The next best I've seen so far was 10 or 11psi, and higher than that would be getting a little too close to 14 for my taste. Anyone else have any ideas??