IMHO, as long as the width of the locking portion of the liner drops into position completely behind the tang of the blade, it is working properly. This of course, probably should NOT be dependent on whether the knife is opened slowly or snapped open.....it should fall completely into position either way. The liner should not cross the tang and rest on the opposite side liner....THAT would indicate a potential problem to me. I like a liner lock that is NOT easy to disengage fom the tang. I wipe down, but do not lubricate this area. the differential metals (titanium and blade steel) seem to have a little "stick" that I do not want to interfere with.
All of this liner lock stuff that came out recently probably only has one GOOD result.:
EXAMINE YOUR OWN KNIFE and determine if YOU are comfortable with the lock security. (there is plenty written on a multitude of tests right here on the forums.) After all, a liner lock (AND the hardware related to it's security like the pivot and stop pin) has a lot of complex geometry to it's works. I am CERTAIN that a lock can leave the factory solid as hell, and after a little breaking in, no longer perform.
I regularly examine my knives, firearms, and any other tools I may call upon to use in an emergency. It is MY ASS (or fingers,) and MY ultimate responsibility. If it's broke....fix it or get it fixed.