Your finishing stopper looks fine; it is seen in commercial fishing knotting
among other such multiples of Overhands (the Half-hitch is in a sense a
biased Overhand). I think that the orientation that you have for the HH
(making a sort of Clove h.) is maybe the better one (vs. Cow-h.-like).
Did you try my suggestion to tie a Slip-knot (slipped Overhand) and then
bring the slip-bight around the <everything, i.p. the source/ball of cord>
and then pull it tight for a similar choking, bulk-inserting structure? It
looks to me that that structure can tighten more (though this much might
not be needed or all so helpful), as the final bight-choke-tightening acts
like a claw hammer prying out a nail, in pulling out some of the cord.
--dl*
====
