Really solid looking team there. You do seem to be short on Lightning Rods though, seems Sherry is your only one. Might want to level another one (Kerry or Themis I guess, Lucille is too expensive for that role, Elva probably is as well)

Next on AW list I'd pick Saki or Zola, maybe Mehlis. Saki's UP cost drops by 2 on AW (part of being a Ninja) and she's a fast attacking range on melee slot, Zola loses 10 range in exchange for faster attacking and is super-helpful on Crystal Keeper's X and G tiers (and earlier but high level archers suffice for H and below), plus she can switch to magic damage against armor using skill. Mehlis attacks faster and is a cheaper alternative to Garania, with range extension instead of blast radius increase.

As for Shizuka, with the unit rebalance a few months ago, Samurai now have the stats to justify the cost, more or less, and Shizuka is the best of the bunch. She's a mid-map sweeper for anti-rushing and has decent bulk to take a hit or two. Worth a look, especially as a cheaper alternative to Elva (bulk is comparable until Elva's Paladin class AW buff at 50% HP kicks in; slower attacks but hits 2 at once; heals self instead of attacking faster in terms of skill)