Yes, your ">=i190 means max stats" supposition is correct.

I documented the mechanics and put up a thread with a bunch of BiS sets for i80 sync Frontlines back during 2.3 to 2.5.

The main reason I didn't put up one during 3.0 is because the answer to "What is BiS?" pretty much ended up being "wear the i180 pvp left side and as few accessories with accuracy on them as you can" for every job.