Shock dyno?? I don't think f tuned have it. I heard bc and isc also gave shock dyno, but still rides stiff.
Any other shop that does good rebuild or revalve for coilovers?? I know one which my friend recommend, ah sim prs seri kembangan.
A shock dyno is a shock dyno. It doesnt really tell how it will ride on a particular car. For example, all BC shock dyno looks the same. Their adjustable may work on a particular vehicle but not others (hint: generic valving). There are plenty of parameters to be considered when designing a vehicle's suspension (bump travel, wheel motion ratio etc) - so far i only know rcs which measures all this. Others are using guesstimate and gutfeeling.
Fawster provides shock revalving service too.. ask them if they can provide alternative piston that may work better than the stock taiwanese piston.
Its possible to make your ISC feels better but it depends on the tuner's expertise. its not easy like just swapping shims to change the valving.. there are different types of piston too (linear, digressive, double digressive etc), shock oil etc..
If not you will end up trying and trying endlessly