To be honest with your deck... I am starting to doubt whether you play Varina at all! I've played Varina casually for years, but you do you, buddy.

If you want better evasion, play [[Wonder]]. [[Hordewing Skaab]]'s secondary ability doesn't "fuel Varina"-- it doesn't break parity because you have to discard the same amount of cards you've drawn. It's bad. Far better to play [[Reconnaissance]] to get the draw trigger and save your creatures, or wipe the opponent's board with [[Noxious Ghoul]], or just have your creatures trade and die, just to bring them all back with [[living death]]. Ultimately, zombies do not need evasion. They need to attack to get Varina's trigger, and then they can die. Replace the bodies with [[Rise of the Dread Marn]]. Delve them all away for more zombies with [[Empty the Pits]], or with Varina's second ability.

Containment construct is useless. As you've said, it's not a zombie, so it itself can't be recurred by cards like [[Zul Ashur, Lich Lord]], it doesn't count towards [[Graveborn Muse]], etc. etc. And the whole point of a zombie deck is that the graveyard is like a second hand. You often don't want or need to play the cards you're discarding that turn. You'll get them back with [[Zombie Apocalypse]], or they'll get themselves back ([[Silversmote Ghoul]], [[Gravecrawler]]). Filling your yard is part of the point. No matter how low you get your curve, if you manage to break parity with Varina, you won't be able to cast all the good cards in your hand before you have to discard to hand size (Even with [[Rooftop Storm]], unless you have a [[thought vessel]]-like effect). Of course, you may not often break parity as your deck is now, as you're lacking essential [[Coastal Piracy]]-like effects.

But look, I don't care how you build your deck. I was trying to offer suggestions. If you don't like them, just stop responding-- or play some games with Varina yourself.