the DED down is ok for shield poking, the third hit might get it or the fourth. unfortunately, the third hit down has too much lag to follow up with combos.
making up for lost posts while on vacation, bair approach isn't worth it. the uairs can be used to intimidate, but isn't a good approach because you need to set it up with Dtilt or Uthrow. I like Nair approaches because fair can get them off of sweetspot range and doesn't do as much damage. the dair is not very reliable, but can be used to tech chase if used right. if you can't get your back to face them, you can also get the meteor smash if you're right above the enemy. the three neutral DED hits are the best. It can get them off the edge, but is also just a safe approach/move.
I use Uthrow for setups and Dthrow to Fsmash, I should use Fthrow moar, and I'll occasionly do Bthrow off the edge because it looks like it has farther knockback. jabs aren't very useful, maybe to quickly cancel an attack if you don't have time to counter. I personally don't use Ftilt, maybe it's ok for mindgames since it's faster then the Fsmash, but i don't like its upward knockback. the third down DED is fine against samus and others who CC, but >B^BvB is a bad idea. I sometimes try>B>B^BvB, but I can't say that's a great idea either.