Both of my rear Buddy Club shocks are blown and I replaced them with my former kit-Tokico D-Specs(about 80K km on them). I bought Tanabe GF210 springs.
Put them side by side...oops. Looks like I lost 2" of rebound travel with coilovers. I was wondering why car felt weird/bouncy/binding at the back-blamed it at wrong shock settings. C/O shocks were just too short and probably outside wheel was loosing traction in the tight section of the track-hanging in the air.
Result-I was 2 seconds quicker at the same track with old and beaten D-Specs. Ride height stayed the same(another pic).
Check videos-look at left-right bounce at the slow/tight section of the track. Even engine note is "wobbly" with coilovers. Look at corner speeds in both videos-update is a bit laggy, but gives an idea.
With coilovers(not blown yet)
with D-Specs

If I ever bother to rebuild the coilover shocks, I will try helper springs to get back rebound travel. Not sure how much I can get there without bottoming out though...
Any thoughts?