The key is to wait until the exact moment that the MB grapple expires. If their head is still swaying, it alters the hitbox just enough to make the bat whiff.
Walk forward after the grapple and bat load, do not dash.
113 consistently connects when the reset is done on the right side of the screen, or in the corner. On the left side, its virtually impossible due to extended pushback. F2-grapple is your go to followup in this situation. The last recorded clip demonstrates this combo.
The same combos can be performed with multiple bats. However, if you do this midscreen, the second/third bat will cause further pushback, so you are required to use f2-grapple as your followup on both sides of the screen. Multiple bats in the corner can still be followed up with 113 or anything else.
You can't set the CPU to duck when recording, but I tested all of these against a ducking CPU and the j1 still connects when they duck. The timing is slightly strict - you have to connect the j1 right as the grapple expires, but before they're able to start ducking again. But its honestly not that difficult with practice.
This reset is difficult to virtually impossible against short characters.
Shame this wasn't discovered before EVO, but hey, better late than never.
@Nubcakes (dont know his name)
@AK RM Blake
@ whoever else I'm forgetting