Let's make something clear: "optimal" is almost always a qualitative measurement based on subjective impressions. Sure, it can also have numeric backing, but when its literal definition is "best or most favorable" you're talking about subjective impressions...so what's optimal to you may or may not be optimal to me. In specific: I find the #2 setting on the AntiRock to be optimal for the way I drive my TJ on the street. #1 is a bit too stiff and #3 is almost as good as #2, but allows a bit too much body lean in a hard corner for my preferences...so I use #3, and I drive my TJ on the street regularly. I found the stock front anti-sway bar to be WAY too stiff: it made the front of my Jeep feel like the back end of a wheel-hoppy M3...but that's all in the way I drive and the way my garbage suspension is set up at current. So, with all technical discussion aside, you need to stop dealing in terms that require abstract superlatives that do not exist, or you'll just fall right back down another rabbit hole.