If your riding on the road at a reasonable speed with your suspesion set up to your weight then you probably won’t need it.
So, first things first - get your suspension set up properly. The new shape R6 rear spring is probably to strong and getting it changed should help a lot.
As for the damper try it on the softest setting and ride on a mixed road for a while then go up one click … when you feel it’s intrusive go back a click.