It's been a while since my big tantrums over this game's balancing hasn't it? I've been tempted to give this project another shot lately, especially after seeing talk of rebalancing + the existence of some sort of guide I'm gonna try to follow later.
I like the idea of modifying the mimic dummies' stats because I'd love for less non-boss hitsponges in the game. The core challenge mainly comes in managing mobs that spawn in every turn in order to prevent being swarmed into a glorified fail state and making a 3-dummy encounter both more manageable and more punishing would be a better fit to the game's overall pacing.
Another thing is that I wish I knew how to tell what skills synergize well more easily. A Z-List Skill could potentially become S-Tier if matched with the right build.