This is a fun "thread", pun intended. Great info here and will add my beeswax to it!
I do knot thread at the spool end of thread. Put several needles on the thread before cutting each length.
I cut thread only between 18 to 20 inches long.
I use any wax I can find, I have some of my favorite sented votive candles that I use and it smells real nice while sewing.
I run my threaded needle under a low temp' iron after I wax it to remove excess wax. It gives the thread some body also, sort of like starching.
I drop the needle to let it untwist as I notice it curling.
I do still get knots, just not so often.
I love needling.
peace
:D