The Airwalk and Tailwalk are consistent. Most of the time the issue stems from one of three things:
- The animation that happens when holding Right Stick down not registering or completing.
- Doing the grab too soon
- Waiting too long after holding down the Right Stick to do the grab.
When you move the Right Stick while in the air, the skater will shift the board with their legs. Holding down will bring the board up slightly so a Nose Grab can be done. Grabbing too soon before the animation happens or waiting too long after the animation will cause a FS Grab which will then cause a Christ Air to happen when u do the No Foot Grab.
Personally, I was the having the first issue. I would do a flip trick before the Airwalk and wouldn't let the flip trick animation finish before holding down the Right Stick, causing the board shift animation to not register and not happen which caused my skater to do a FS Grab when I hit the RT. Pressing B for the No Foot Grab would then cause the Christ Air.