When you do the 1 frame setup for walljump, I found that for the walljump part you can consistently 100% of the time get 8-J very easily (Note this only works for this setup) Basically you just do a full jump to bonk the roof, and then you hold down+right midair, and you'll end with 8-J every single time Before I did this setup I would most commonly get 8-I, sometimes 8-H or even 8-G, and rarely 8-J.