Re: iron cobras sluggish? Don't loosen the springs
I have always found this to be the case, regardless of the pedal manufacturer. The looser the spring, the more sluggish the return is because the spring is using less tension to return the entire movable mass back to neutral. I would imagine the difference in return between the two pedals is that the SC has the cobra coil that helps return the foot board to a static position and I am guessing your IC is older and doesn't have the cobra coil.
Wanted: GURU 13x7 Segmented English Ash & Ovangkol with Ovangkol Segmented Hoops