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When I tie a timber hitch, I take a "round turn" (540*) on the throat, ... I can post a pic if interested?
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Great! I was wondering if that version had been tried in the
field, as it seems to offer attractive qualities of being able
to keep the knot snug w/o tension (the round turn providing friction
grip), to lessen the forces that must've pulled out Luvnik's tail
way back when (I do recall that post!! the paying audience (clients)
thought it was a deliberately executed nifty swift drop; while
the workers knew otherwise, thought "holy HUH?!", and
messed their pants

).,
annnnd the full turn (or two!) at the throat probably lessens the
irritation/friction on the main line.
--a photo of how you set the knot might be helpful.
Ashley's Book of Knots #1669.
*kN*