The kit doesn't relocate the positioning of the T/A. It merely moves where it mounts, while keeping it in the same location. It shouldn't have effected your pinion angle at all. If anything, the added vibration is due to your T/A being mounted onto your chassis. You no longer have the rubber isolation offered by the transmission mount.
Strano 550/150 / 35/22 / Koni 3/4 / JBA / SLP / K&N / Pro5.0 / UMI / Prothane / LS7 Clutch / Patriot Gold / TR224