Well only way to get more droop in an sua is those revolver shackles or longer shocks that don't limit down travel.
Going SOA would greatly increase the droop especially with waggy springs, xj springs will net about 8" of stretch and with waggy springs up front that's another two inches, looking at around 106" wheel base. Which seems crazy long to me lol the guys I run with have 4" of stretch with waggys front and rear and I'm running waggys in the front and an inch offset in the rear. It all depends on what kind of wheeling you do and what best suites your needs. 100" wheel base is great for rock crawling and tight technical trails but if you don't run them then go big lol
I'm running waggy fronts with stock shackles and stock springs in rear with traction bars for axle wrap and I can flex like crazy!
Just a couple examples of the flex you get from SOA with waggy springs. =)