I have the lightest Wilson springs in mine and have no issues with light strikes.
I removed all the internal burrs (friction points) so that there isn't any additional resistance from these imperfections that would slow the movement down.
Edit: just noticed this is for the SRH, so not sure how different it is compared to the GP100
I keep the stock main spring; and after a good trigger job (stone/hone/polish), I'll install a lighter Wolff or Wilson rebound slide (trigger return) spring. Over many trigger jobs I've found that with a good job as mentioned, the difference between an aftermarket and stock mainspring is vertually not detectable.