Looks similar to my SU360. I had to grind the left upper tab of the mounting bracket a bit for the top of the shock to slide in. Not sure if that was the case for your TTX. For aggressive riding on the street I'm running 8 clicks out on rebound and 25 clicks out on compression.
The front acting funny is probably due to changes in the fork rake. Since you lowered the back ,you now have a shallower angle at the front, making the bike more stable and steering less responsive. I would try sliding the tubes a few mm up the clamps in order to bring geometry back to specs. Also, keep in mind that the rear linkage is rising rate, which mean that you are now riding at a stiffer point of travel that when the bike was stock.