I like the aluminum cam jam, but I never used it like that, will have to give it a try.
I did what
@bongo did I tied the HC rope(I actually used a strap I had laying around) to the center of my webbing that holds my feet that way when I need to slide my feet in I just pull up on the rope. I don't leave mine connected when I get to hunting height I disconnect my HC rope and tie it to my gear storage strap(bow/backpack holder).
I'm not sure you really need an adjustable rope for the HC, will have to try.
Oh I also pull up on that strap a lot when climbing. Not sure how that will work if you are using 550 cord. You will notice that when climbing like this your legs, at least for me, are not used to pulling up to your butt so I found it is nice to help my legs with one arm, the other arm holds me off the tree.
Also one thing I do is stand on my tippy toes and pull up on my tether ropeman to tighten it as much as possible then I sit down setting the tether on the tree(it will move down once you put weight on it) then stand back up on tippy toes again and tighten again, then I sit and pull up my HC.
Ideally you can get a few iterations of moving the HC up before having to adjust the tether, sometimes you have to adjust every time.
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