j.a>j.b works on everyone because 2c on downed puts them at the lowest height possible for it to connect youre probably not delaying the j.2a>air dash>j.a long enough and the ender part all depends on your starter, and its 236b for renka now lol(i kept forgetting this too)
if you do 236b(1) or 5c starter then you can do sj.b>j.2a>air dash>j.b>j.2a>j.c with ease, if you have 3c or 5b starter youll have to settle for j.b>j.2a>air dash>j.2a>j.c which works on most chars, and sj.b>j.2a>j.c for the stupid ones
ill do some more testing later