Firstly, Wasting followed by unmaking does 8 wounds on an 8-9 wound model. Since my main hurdle is Seamus and his Belles, that means 3 turns to kill Seamus, or 2 if a Belle has lost 1 wound. Secondly, how do you have Leve running up the field, Waif springboarding, and keep Alyce in range AND use Rapid Fire? Summoning Leve back next to Alyce just means that, if I lose the Initiative, they'll step behind a building and I'll lose both of their damage outputs.
Honestly, I've had a lot less success than you with her, if she's any good at all. Even after reincarnation and deaths lessons, with a decent set of cards in hand, she rarely seems to do any damage. As I said, I've only had the chance to do 1 headshot. Another problem occurs when taking into account my metagame (I didn't expect you to know this, don't worry), in that Seamus doesn't care, just uses his (0) action to re-raise the Belle I kill (and I'll rarely kill more than 1, especially ive Leve's spent a turn being mediocre), Raspy makes soft cover so I can't cheat, Pandora hides the only things that arn't either massively high Df or Pandora herself. Which leaves Lillith's lot as the easiest to get it off on, and even then the extra cards and 6 Df each makes it hard.
The extra cards help me ensure I reach my cap of 6, they don't extend it. Even with 8 cards and Deaths Lessons, you can't have Leveticus doing multiple unmakings and Alyce doing headshots without being extremely lucky. Assuming Leve's mediocrity requires 7-10's, chances are his 2 spells won't be those, so youll need to cheat them. Then Death's Lessons, then Alyce's Rapid Fire requires a discard and 3 good rams. Even if you're lucky enough to get one in Death's Lessons, you're still requiring 4 relatively high, specific suit cards per turn. That's just not feasable.
I have been letting him die up till now, and my group have suggested not letting him die to keep that extra AP. And I think you're overestimating Death's Lesson's tbh. Assuming your 8 cards drawn before and though Leve's turn are four 2's and 4 6's, you've still got a 1 in 3 chance of getting a 10+, and a 1 in 12 of a specific suit. That only gets worse when you do flip or draw high cards. From my experience, Death's Lessons, 9/10 times, gives me a good enough card for any of his 1suit spells, and, maybe once a game, the suit I need for something to happen. While it's good, It's not godlike, from my experience atleast.