houtex, first off, welcome to the forums, hope you hang out and really learn to enjoy the experience and knowledge available here at BFs.
With AO's there are so many factors that come into play that determine how a specific knife opens.
The torsion bar is obviously one of those factors. We struggle in our decision making of how "fast" we want our Speed Safe to be.
We had a big debate yesterday on how hot the new Shallot should fire. Craig, being full of excess testosterone decided on hot, we agreed this time, so there you have it. Different torsion bars on the same knife can obviously make a big difference.
It is not always our intention to make a specific AO the fastest we can every time out, so you will see some variance from model to model. Not sure I feel faster is always better.
Thumbstuds vs. flippers, the knives internal cavity, geometry, size and weight, user enthusiasm, can all play a part on an AO's final quickness.
Hope that helps.