When I lifted to 7" it brought with it tons of issues. I lowered it to 6" and still had many more issues than when it was at 4".
I definitely recommend a SYE kit and custom rear drive shaft (Tom Wood). This will allow you to ditch the TC lowering kit, too, which places too much stress on the motor mounts, not to mention that it defeats the purpose of a lift. Consider installing a mid '90s ZJ pitman arm (provides 1" drop).
RE drop brackets w/ support braces will greatly improve driveability and help save the control arm bushings, because they position the control arms closer to stock angles. Hitting even small holes or other road imperfections with high-angled control arms will jolt the hell out of your rig. If you don't already have adjustable control arms, then you may want to weigh this option against long arms.
You might want to consider something like Currie's steering set up, which provides better operating angles than stock. 6" of lift on an XJ seems to be the threshold where you start running into more serious issues, especially with caster angle and front drive shaft vibrations. That's one of several reasons why I recommend not going any higher than 5.5". If you need to clear 33" tires, just trim the fenders.