I wouldn't mess with the actual spring tension as it can cause clutch slip, and if you have Any performance upgrades or plan to upgrade, if anything, you will need to increase the tension at the main spring.
Pull effort can be reduced even with the main spring set as tight as possible by doing a few simple geometry changes... one of the easiest is to ditch the short straight clutch arm and install the longer bent arm, this puts more leverage at the clutch cam which in turn makes the pull lighter at the lever. If the pull is still too hard, there are other types of levers that'll work.
I agree to stick with the basics first, then if that doesn't help enough, there are other ways, but loosening the main spring should be avoided