You said that you're using the arrow keys for grabs, and that surprised me since it seems a bit counter-intuitive.
I'm sure it's pretty set in stone right now, but I have an idea that could be better.
Basically, the skis are modeled on the keyboard, so 1QAZ is the left ski, while the right ski is 2WSX with the numbers being the nose and Z and X being the tails
There could be two "function" keys, so that one crosses the skis(maybe Shift) and the other function key would cross hands over(maybe D)
For example: For an English muffin, you would do D+1+C, so that both hands are grabbing the opposite ski. If you wanted this to be an octograb, it would be Shift+1+C, so that you're grabbing the left ski with the left hand and right ski with right hand, while crossing the skis. A japan grab could be A/S+D, and a Liu Kang would just be S/A. Get it? And then farther behind the ski is the tail grabs.
The only problem is that there's no button for safety, but that should be easy to sort out, if this is used.