Just a quick note on 1 2 2 Forceball 3 2 Forceball 3 2 1 Slide:
Make sure you're doing Fast Forceball (bb3) and Slow Forceball (bb1), respectively.
From my tests going 1 2 2 Slow Forceball 3 2 Fast Forceball 3 2 1 Slide is 33%, as opposed to 34% when done Fast then Slow.
Only 1%, but I'm sure there will be at least one match in which it matters.
As for comboing the 3 2 1 Elbow Dash (Whiff) nJ1 3 2 Forceball Forceball 3 2 1 Slide:
I find the best timing for the jump if you're having trouble with it, is to hit up the moment you see Reptile clear the other side of the enemy, and then punch shortly after. Here's some clarification on the punch timings with some examples of what happens if you do it off-timed, since I haven't really found a visual clue as consistent as with the jumping bit:
If you simply punch after reaching the other side, you've either hit punch much too early or more likely jump too early.
If you do an empty jump with no punch after reaching the other side, you've jumped at the right time but punched too early.
If you do a jump with a punch that whiffs after dashing, then obviously you're punching a bit late.
As for invisibility, I think I read somewhere that it has projectile invulnerability, but I can't get it to work for neither regular or EX, so even if it does have it, the timing must be pretty strict.
But beyond the obvious advantage of using EX Invisibility, I don't see much use in it.