Xeph
#TRYHARD
With Astaroth's recent buff towards his CMND A+G, you should also we weary of it's potential damage. JF A+G CMND grab, with clean hit, and BE is about 107dmg, with RO potential (If Astaroth's back is to the edge). The best strategy is to apply good TC's VS Astaroth. As you mentioned, 4B would do the trick.All I know; Raphael is a grab happy Astaroth's worst nightmare. When Asta has meter, be ready to break the B+G grab. And if you know a grab is coming. Just 4B the grab for a combo. And a good Asta player will know his 66K beats all your prep options.
In short for Asta: punish all whiffs with 236B, with meter break B+G, and 6BB is great for zoning him.
Not much info for Leixia, but you can punish most of Algol strings with 6BB.