Now you can chain throw with it, but I think the movement is too slow which means he will get away before you reach him. I would highly recommend dashing with the Fthrow. That is what I have been doing and it works but as I write this, you gave me a good idea! What if we use the AS to help with the chain throws! lol seriously you did give me a good idea.
Even though I don't recommend starting the chain throw with the AS, it could be good for continuing around where the other one stops or at the beginning for certain characters. Let me explain
If you see my matches against Ganon, I have missed a lot of my chaingrabs due to him side stepping because I think Ganon is one character who can get out of it even a 0% surprisingly. The only way to get him with that is if you catch him off guard, HOWEVER! You can use the slightly slower approach to this situation. If your opponent knows that you are going for the chain grab and they know they can get out of it with a spot dodge, then this slower approach will work. It will work because as they are dodging, you will be traveling and by the time you are ready to grab, it should be around the time where they are vulnerable to your grab no matter what.
This could work well for the same reason against those who can escape when the percent for chain grabbing is too high granted they spot dodge to avoid. The extra reach with the pivot grab will help also