1. the eibachs made it handle flat as anything... blew out a rear bushing on the bar but i think install error.
2. the whole stiffer will make ride quality worse is sort of not true. Look up Xida club sports miata... they typically run 700/400 inch lb springs and the ride is MUCH better then stock. Reason being the shock is matched to the spring... again those are 2k coil overs.
I am still in the process of learning suspension geometry and shock dynos and such... but I would seriously look into a matching set up.
If you want to get real serious some koni yellows and ground control sleeves (for corner weighting) and matched springs will help.
I am not sure on mustang geometry and can only speak for miata stuff. I would talk to a sharad or someone who specializes in mustang suspension (sadly I dont think AM qualifies). And races it.
2012 v6 6MT: 32kmiles
Current: Air Raid CAI, Diablosport intune, FRPP sport axle backs, Strut tower brace, 3.7 emblems, eibach adjustable sway bars, J&M lower control arms, 3.55 frpp gears, axle exchange aluminum drive shaft, 19 inch BBP wheel set up
wants:no more issues
2002 mazda miata 5MT "track rat
Future" Custom valved and springs Fat cat motorsports, 9LB wheels, toyo proxxs r888, turbo pushing 250whp, sparco seats, custom roll bar