Why don't you try running a Roots + Sentinel half?
Morgan/Luke/Tobbie, it depends on the week and what the rest of your deck consists of. I'd go Luke personally.
Carmen, your key SoA when you got a 3/1 split.
Havok, you can get away a lot of times against weaker cards with this guy.
Flinch, i'd swap to him as you get into the Higher Elo score, he seems useful but Melvin till then.
If you want Jackson in there, Yookie - Flora and Jackson - Melvin fits him in there.
For your deck,
Valentina Ld - Flinch, 2 Revenges is a risky strategy. Plus he owns against the Ghiest + Roots.
Kephren - Michael, Michael's a beast.
Liam - Redra so you sort of replace that Dr you lost before.