I am personally against using an RSL, but I can very much see that in the case of a low level canopy collision, they could be extremely useful.
So, the idea of disconnecting your RSL once your main has deployed correctly seems a little crazy! Now you've used an RSL where you don't one and disconnected it when you do want one!
Anyone ever considered connecting their RSL under canopy!!!! This would actually seem quite logical.
As for getting dragged on the ground, learn to collapse your canopy then cutting away is not necessary. Pull one brake line in until you get fabric through the slider grommit, whilst running around the canopy to the downwind side.
Paul.