I’ve been reading this post because I had these issues about 1.5 yrs ago combined with terrible wobble every time I hit a bump in the road. I got rid of the wobble by replacing the draglink, trackbar, tierod and falcon SS. I also put on adjustable control Arms and moved my caster to 6 degrees. After all of that it still had the dead spot in the steering and wondering. I finally gave the steering box adjustment screw about 1/4 of a turn And took it for a drive and the steering was a little tight and wouldn’t return to center. I backed it off about 1/8 of a turn so it was about 1/8 turn tighter than stock and wow, steering was right on and better then new. No dead spot and the steering has been awesome for over a year now.
My wife bought a gladiator last summer and the steering has been much better than my JL. I did replace the SS with a falcon stabilizer. I added the synergy trackbar support and sector shaft reinforcement to her gladiator. It did make a world of difference to some of the wondering but I am questioning the setup. It was difficult to install and started making some creaking noises and I had to grease and retighten everything. Kind of a PITA but it did tighten up the steering.