Honestly, EDFC is for old ladies or ballers. I've driven a few cars with it and it's not like it can transform a race car into a Cadillac.
Damping adjustment is a MINIMUM requirement on coilovers, as well as shock body height adjustment. Adjusting height with the spring preload is bad.
Here are a few options for you at a couple different price points.
Tein Mono Flex Coilovers Nissan 370Z 09+
Cusco Zero 2E Coilovers Nissan 370Z 09+
Ksport Coilovers Kontrol Pro Damper System Nissan 370Z 09+
KW Variant 3 Coilover Kit Nissan 370Z Coupe 09+