If is it brand new, it may need a little breaking in. Does it stop there every time? If not, that would point more towards a new knife that needs breaking in. Also, you may just develop better form, and get better at consistently flipping it open all the way. That big knife will not fly open as good as a little Kershaw will from day one. I would give it some more time.
Some ZT/Kershaw thumb studs are just useless, and there are back and forth arguments about whether it is indeed a thumb stud or not. For me, I don't care, the flipper is the preferred method of opening. In fact, I de-assist most of my Kershaw's. I know they call it Speedsafe, but it is not very safe to close imo. Some torsion bars have to be so thick and tight that they put considerable resistance at that point when closing one handed to the point that you can slip and get cut. Plus, I also do not like thumb stud only and Speedsafe, you can slip on opening and get cut. Their knives are good enough that with practice, any of them can be flipped manually just as fast. I would search and see if that model (sorry can't tell from pic) is easily de-assisted and try it out that way. You can always go back if you prefer. I think they make it an easy switch on purpose, they may not admit because it probably voids the warranty, but it is pretty simple to do. Just make sure the knife has a detent as some assisted knives don't, they rely on the torsion resistance for retention.