Can you all see better now? 'Cause the light just went off in my head! Or would that be "went on"?
I wonder if having a standard shock cord setup (where the shock cord is clove hitched to some guyline and both are attached to the tarp D ring) attached to the line loc via the guyline would give an extra degree of safety. This way, if the shock cord failed, you would still have the guyline attached. Basically, you're just replacing the guyline from the shock cord to the stake with the line loc and a guyline with the loop spliced in the end to go on the stake. I might carry a couple of sturdy mini-biners or soft shackles to use with the stake end loop on permanent objects like trees that are used in place of stakes.