try inputting the A-stick/C-stick slightly later, i.e. after the airdodge, and try airdodging slightly later perhaps. See you can only buffer the one input after throwing the bomb.
Otherwise you can just do the throw re-grab and re-throw by spamming the grab button. There are a few ways you can do it.
Otherwise you can just do the throw re-grab and re-throw by spamming the grab button. There are a few ways you can do it.