I felt the same way you did, but the Spec is so grabby, I felt like I couldn't get consistent smooth releases, then started inking about it and decided to try the spring.Funny that you mention the assist spring, I was just thinking about that yesterday!
I have read about the improved feel with the spring removed, but since I have no issues with my clutch, I have been hesitant to do it (if it aint broke, dont fix it, kinda thing).
What made you take the "leap"?
I hope you're a smaller guy with small strong hands as it was frustrating as hell for me and big shoulders.
Immediately it was easy to modulate, I'd recommend it even if you feel calibrated to the spring and stock clutch.
-J