Cm870 vibration concerns

[Precisionw900]

So finally got time to put on a new harmonic balancer and run the leak down test.
Turns out I’ve got an injector leaking. My question is how close to your”a”- “b”- “c” marks are you seeing your bubbles? Mine is starts to push a bubble between a-b but doesn’t fully bubble in cup until “b” passes and compression stroke starts to come off. I bared the engine over 6 revolutions on front and rear bank each to be sure. If that’s considered bubbles on a-b looks like #4 is coming out. Thoughts?