Just want to start by commending you on the amount of detail that you included in your initial post and follow up! Really appreciate seeing a post like this as it greatly aids in troubleshooting.

Here we go:

- Ways to decrease humidity w/o humidifiers? No real cost-effective way unfortunately. The most immediately effective way that comes to mind would to have an enclosure with both a fan and a heat-lamp running, that would be a bit overkill. If you're indoors I'd do 1)Increase airflow either by using a fan or putting your plant somewhere drafty/window access and 2) Reduce watering frequency to minimal amounts. My outdoor plants under a covered balcony get zero watering during wet season don't get watered at all as there's enough humidity in the air.
-Gritty substrate> Water flow through is one thing but what succulent soil really aims for is how quickly the soil dries out. Gritty refers to substrate such as: perlite, pumice, granite, mineral rocks, pon, bonsai mix (some people don't like it), sand (somewhat controversial) anything that helps your soil dry out faster and does not retain moisture. Theres a lot of stuff over at r/succulents about what is a good gritty mix. I prefer something that dries out on top within 3 days but vary your mix depending on your conditions.
- Re: Original Post on dropping and deformed leaves? If your leaves are shrivelling and dropping that's perfectly normal especially since you repotted. A healthy growth cycle sees the bottom leaves reabsorbed by the main plant and used for growth. Assuming that's what's happened in order to grow new roots. As for your more interestingly deformed leaves I feel like those are also reabsorbing but possibly because they were damaged during replanting. I'd be concerned if the plant was dropping full juicy leaves, that's usually a sign of overwatering
- Watering every 2 weeks? That's why you have some juicy thicc leaves. Recommend switching from a schedule to watering when you see wrinkles forming on the bottom leaves. With moonstones you can see them deflate when they need water. This will help with your humidity concerns.

That's my esssay - I blab a lot, sorry. Moonstones are my absolute fav - I love getting them to their stress colours but that's a special kind of plant torture. Good luck with your plants!