While low skill doesn't hinder Shuka's performance that much, max cost hurts. While she would still be able to serve as a good ramp, and 2-block-2-attack still helps clearing rushes nicely (and 30% dodge helps her survivability during all this), number of maps where you can drop her as a first unit to make most of her cost reduction lowers considerably. Well, AW Jerome's passive will help, sure, but cost issue would still bump her awakening priority down a bit (and you really want to awaken your advance guard to make most use out of them).

And I wouldn't really put off raising Sherry that much. As you already have best lightning rod (Sophie) and one of the best physical duelists (Clissa), you don't that much need your princess to be tanky one, and while Claudia's true damage is certainly appealing, AW Clissa provides that (at 30% chance on each attack), so high-powered princess with AW passive that boosts near half of your army seems to be pretty neat investment)

You may also want to look up videos for G-tier daily maps and compare them with your lineup to help you decide on units you want to rasie afterwards.