We have found the same inconsistencies in getting to the click, but the running pressure results seem much more reliable. It should give a running pressure about 160psi(at 100% IDC) with one turn back.

How much is your pressure gauge moving? Try pulling the jet from the car and putting the test jumper on and spraying at 100% as this will hold open the FCM and possibly give you better reading. We usually measure running pressure at the FCM inlet but that shouldn't make a big difference.