Hey all,, final update (well at least for now)
New tires def made a difference as i said above... Had Steeda's rsb installed this morning and it does make the car handle much better... Not to Ti standards, to be sure, but def better.. Corners flatter, better and/or sharper turn in (some of that no doubt due to the new tires), less push in taking sweepers and on/off ramps faster... Do feel the bumps a tad more but it's barely noticable -- very solid feeling.. The jiggle-ness of the rear suspension w/ the oem set up over multiple bumps is totally gone. Def feels as if there's more 'connection' with the pavement. So far, very happy w/ my investments.
tightened it all to 42 ft lbs of torque as advised and greased the hell out of the bushings... No squeeks or clunks or bangs or any noise at all.