This popped up on Reddit today, thought it might help.

(Images such as ">^" Imply up-right diagonal, X implies no input)
(Left Analog Stick is labelled "L", Right "R" respectively)
These are all assumed right food leading, mirror horizontally for left
---L---R---GRIND
---^---^---X-Grind
-->^--^---Soul
--->---^---Soyale
-->v--^--- Pornstar
--<v--^---Mistrial
---<---^---Mizou
--<^--^---Acid
---X---<--Fast Slide
---X--->--Pud Slide
---<---X--Backslide
--->---X--Torqueslide
---<---<--Royale
--->--->--Full Torque
--->---<--Unity/Savannah
---<--->--Cab driver
---X---^--Makio/Fishbrain