For anyone still interested in the direction this thread went. I pretty much decided on the new GEN 4 FA500's that came out. I was at an utter standstill between stance GR+, tein flex, and the FA500's.
Why I'm picking the FA500s? Decent performance, dyno matched sets with included dyno of YOUR shocks, assembled in the USA, serviceable in the USA, and best of all... 5 year warranty.
Fortune auto now also offers the coilovers with tall or low springs. Im still trying to get info on what heights each spring achieves, but so far it was described to me as "low springs go SUPER low" "tall springs are functional"