So A very determed me decided to slingshot a level 20... how hard could it be, right? WRONG. Darn rascal took 25 minutes, 9 slingshots, and like 400 rocks. Beefy bugger also took over FOUR HOURS to tame. Took like 150 mejos and maybe 300 narco berries. Moral of the story, use tranq arrows and aim for the head.
It seems I was able to pick up the gas bag with an argy. I then could pin it down and build a trap around it and the argy for easy tranqing. When inflated they appear to take less tranq damage, like a doedec.