Re: 3 inch lift issues
If you have "death wobble" you'd know it! The steering wheel will start to shake violently, usually after hitting a bump and the only way to recover is to slow down... WAY down! Another issue is bump steer which can be caused loose or broken parts, or an angle difference between the drag link and track bar... they should be at about the same angle. Parts that are usually identified as causing these issues are loose or worn out track bar, tie rod ends, ball joints, and even hub unit bearings can be involved.
If you've had the alignment performed, the castor should have flagged if it was out of specification. This is a common problem for lifted TJs, and you may need adjustable lower control arms to bring the castor into spec to resolve your problem. A GOOD 4x4 shop should be able to help you get it straightened out. I ran 35s on a 4" lift in my old TJ for years with no problems once I got the castor dialed in. YMMV!