Pushrod length help!

For the record, I already tested the geometry in the #1 cyl valves - the roller tip pattern (used black marker) was right across the middle area of the valve tip, and at 50% lift, the rod and adjuster share the same plane. But now that I think about it, those tests were w/ the test rod adjusted to zero lash w/ no preload- I'm confused - if I add the .040, will that throw the geometry off significantly?

Do I need to test this with every valve? I did the intake and exhaust of the #1 cyl.