Hmm. Well, thanks for projecting that ignorance upon me ; P
As for my suggestions, they work well for my body weight, with the hitch chord/hitch combination, with poison ivy, for me. I have trained other climbers on poison ivy and hitch reactions have been similar.
I size prussics to function with the minimal amount of cord for the hitch to react after deliberating the best hitch configuration to cord to particular rope. Anything longer, to me, is just sit-back.
For the 4/1 Distel, I use a 28” for 10mm, 27” for 9.3mm, and I suppose 26” for 8mm would follow. This creates a nice, compact knot that grabs right away without the need for tending. It fits well underneath a wrench on a shorty tether. I trained a climber who was 155#, and he got similar results doing a 5/1 knot with a 28” 9.3mm RIT on 11.7.
As there are so many combinations possible to use, even with a single kind of rope (as this thread is discussing), I think it’s useful for people to share their particular experiences for anyone who might identify with them.
Still planning on revisiting the Michoacán. Removals today, big removal tomorrow. Have to find a day that I’m not feeding a large ground crew to play around with it.