Personally I'm starting to hit down 2 after my j3s, hit or blocked. Down 2 on hit allows for f3, 323 into whatever ender, and also is super safe if blocked. Of course going for the 50/50 is the priority, but it's not a bad idea to throw this in every once in a while.
I've found myself doing that a lot more too , especially when i J3 at that distance where i know that if it gets blocked and there's that pushback that makes d1 / f23 whiff and can get you poked out , d2 reaches ,it's + and on hit allows to continue the combo for 30% or even allowing for the 23 ender.
Also i've scrapped the 123 ender for other similar vortex setups w sword flip , i made a vid for the b1u2 string ending in the 50 50 j3 , there are similar enders for 132 and f3 , most of the times tho you have to make them double guess before waking up so bait them a good bunch of times , this applies to both 123 or other enders , i'd say this goes into the specific MUs setups and their wakeups.
I'll make others if ya want.
I've also got a very tricky setup in the corner.
I also like the crossup f3 midscreen enders , you can absolutely steal rounds w that , 23 ender can also lead to some ambigous jumpins.