It's time I lay a little Maxi Wall combo knowledge on your punk asses.
3A+K, W!, WR A+B, LI K, 6A, RO AK, W!, 4B, LI BK, 2B+KB. Somewhere around 140, give or take fifteen damage.
That's right, 140 damage off of a normal hit low, WR A+B is shakable but even if they do shake it that's a good 70 damage, maybe more.
What's that you say? 3A+K W! seems like it wouldn't be consistent with how you are positioned relative to your opponent, meaning 6A, RO AK won't wall splat? Well you're correct. Sometimes you will be left in a position where the RO AK won't wall splat, however in my tests I've found whenever this happens the other guy is left stunned by LI K with his back towards me, which means I get a free BT throw, adds up to 115 damage.
"But Dr Hobo you panty soakingly fine man you, is this consistent, can you make WR A+B work every time you wallsplat them with" Well......no. I am still testing it to find otu exactly what makes WR A+B hit and what makes it whiff. I can't tell you exactly what decides it but I can list a few things that seem to increase the likelyhood.
Distance seems to have the biggest affect, at first I thought it only worked if you have them right up against the wall and you're as close as possible. But now it's starting to look the other way around, it works much more often if there is a bit of space (only a little bit) between you and them, and them and the wall.
Size of opponent MIGHT have an affect, I seemed to get it more often on Roth than Yun, but when I was testing it on Yun I still thought the close distance was the best way.
I'm reasonably certain I've confirmed the direction the other guy is facing has no affect on it.
Position you are in when you use 3A+K might have an affect.