I own B12's, a great option for lowering ride height whilst maintaining close to stock comfort. B14's might be a little more full-on but best of luck!
As for hesitation, just as you come onto boost, sounds like my problem, a failing fuel pressure pump. Basically starving the engine of fuel under highest load.
Rattle down low and back, if it's more of a clunk, often rear shock setup can be a bit loose. If the bolts aren't tightened to the n-th degree or the bushes are worn you'll get clunk-sounding rattles in the back.
3 MPS - Rolling on Pirelli PZero Neros, sitting on Bilstein B12's, stock internals... still makes me smile with the Zoom Zoom.