Guys, call us at the shop if you're having problems.
To address the issue publicly (and having not stood in front of the vehicle(s) in question):
Everything has an effect (negative or positive) on your trac-bar setup. If the suspension arms (both upper and lower) are set to have your wheelbase at the stock point (not stretching it forward or incorrectly adjusted too short which negatively impacts wheelbase) and the pinion is set per instructions (caster or whatever) then the trac-bar angle(s) will be correct. Having any of these adjustments setup other than where it needs to be will impact how the joint sets in the mount. Just to head this one off at the pass, the notches in all of our tube/suspension/steering related products are accurate. They are all CNC Machined to the correct angle and jig welded for accuracy so the notch in this particular case is not the issue. I machine them personally and, based on how the machine gets setup, they cannot be wrong.
When looking at how the flex joint sits in the bracket you also need to consider how the suspension causes the trac-bar to travel during its cycle. As the suspension travels up, it will effectively cause the trac-bar to move forward causing the angle to change in the mount on the chassis side. Having it perfectly centered would be optimal but may cause it to get very close under compression. The notch is where it is for a reason.
As always, we recommend that you contact us directly first if you have product/install related questions. We can help you in setup as well as act as a direct source of mediation if, for some reason, you have a defective part. Though the internet is a good way to gain information about setup, I believe it makes the most sense to contact the designer/manufacturer as they do have experience with how it was intended to work and, more importantly, can tell you why.
T&T's stand is that if anything is wrong, we'll fix it. All of our XJ products have withstood the test of time and, just like day 1, we'll stand behind them. Give us a call.
Hope everyone had an enjoyable holiday break.
Matt
T&T Customs, Inc.