Did you get any answers from BDS? I just installed the same on my pre-installed fabtech lift and it too seems to be squatty in the front. Looking for measurements for threads above collar as I'm probably going to have to rent the coilover spring compressor from auto zone and take them back off to adjust them for proper ride height. it's so low that my CV axles are slanted upwards towards wheel which is inevitably going to cause problems if I don't address it soon!
EDIT: Found out from BDS that these coilovers don't work with fabtech's components like I thought based off of extended and compressed lengths. Looks like I'm gonna have to find a weekend to take everything off and install BDS stuff hahaha