i de-tweak all my tc's the same way.
get yourself a completly flat surface. make sure its clean as bits of crap will affect your measurements.
make sure there are no screw heads or bits protruding from under your car e.g. totally flat.
put it onto the flat surface and loosen all the top deck screws. make sure you loosen the shock tower screws too as they move about within the screw holes enough to cock up your setup.
get yourself something long and flat, e.g. a peice of steel rod.
place this ontop of the shock towers on the bits above diff and spool.
put a reasonable amount of pressure on the bar and tighten the top deck screws and any other screws you have happened to loosen.
now you can set your droop and things properly. using a bar on setup blocks sometimes causes problems as it just bends the chassis the other way
check for wear on the bottom of your chassis as sometimes you can make things worse.