... when I first make up my hitch it can be really resistant to tending easily....Then I like to try to sit in it really hard, ....
This is the way to properly set the short HH hitch. When I first tie mine it will barely move on the climbing line but then I load it hard by bouncing on it a few times, taking up slack and doing it again. This not only tests my suspension point it stabilizes the hitch so it needs no further adjusting during the climb and will tend slack with just the lightest touch.