Yes droop is controlled by shock length. I think I may have removed the spacers between the spring holders and tweak brace but I'm not 100% certain on that. With my springs set for no preload, they still protrude above the tweak brace a bit, you can always purchase a longer set screw. I can't speak for foam tire sizes as we only run WGT-R here, but I had to put 2.5mm spacers up front and 5mm in the rear.