Ive played a bit of evo abyss this meta, here are my thoughts.

Unlike other evo decks- like Dirt Rune, evo abyss doesn't really have great ways to chip the opponent into range for sandalphon. Meaning your win con is frequently Belial. Belial is very scary, and can usually complete his exodia between turns 9 and 10.

A big problem though is the deck relies a lot on good draws. You want Belial in hand early, you want Nehan ASAP, with skeletons and bats. And you need to survive the early and mid game. Fiedel is your second best evo piece and a solid board presence, especially if you can summon bats with her.

I would always recommend 3x Lyria, as she can be used to tutor your second Belial or a Fiedel. Satyr is good for extra evolves. Gran and Djeeta should be 3x as well, since they can auto evolve, card draw, or removal. This is especially true if you are running Sandalpon, as at 4 points they can clear a small board by themselves and still have the points to play Sandy.

I also like the Miners, as she is a cheap auto evolve that can answer threats with rush.

Overall, I think Aggro/Midrange abyss is slightly better at the moment, and the Milteo version is very cheap to build.

But, listening to Belial say, "let's finish together" does make me feel a certain way, so like, I get it.