I just figured out that you can do a f.H after doing the jamming bomb with jam session that I notated above. So you can do something like this with Dante/Doom assists: BnB to corner, back dash + beam, cr.M, L cube, f.H, L cube, f.H, IAD j.S, pause, f.H~jam session, jamming bomb, f.H, big barrier, back dash, cr.M, fly, IAD j.L, etc.
The following is also possible as well: j.H, L blaster, addf, j.S, call jam session, back dash, pause, cr.M, jamming bomb (or H bomb), snapback/S (no f.H)
The key part here is to get the jamming bomb quickly after cr.M. This is easiest by doing cr.M during the DP input (ie. 62M3S).
And @brainpipe, for Dok/Sent, you can do something like this: IAD j.L, cr.L, st.M, cr.H, IAD j.M, dash, cr.LM, L cube, S, j.MMHS, dash in, cr.M, fly, j.H, addf, S, j.H, L blaster, addf, j.S, back dash + drones, cr.M, L cube, HBR(forward[auto]), jamming bomb, f.H, jump, addb, f.H, IAD j.S, slight delay (so forward air techs don’t go over the barrier), f.H, big barrier
You are also able to back dash after the jamming bomb and do f.H, L cube, f.H, etc, like you notated above, so you can potentially get three cubes (and use two).
If you use EMD with Magneto, you can also do something like: (dash + EMD, H cube, aduf, adf, j.L, cr.LMH, jump, addf, S, etc). This would also net you a cube early on.