For the loose caps, I found that trying out different switches (assuming you have spares) helps. The tolerances between them can vary and so some will grip tighter than others.
I’ve actually now also installed a set of low profile keycaps:
Which I got from here:
https://www.amazon.com/dp/B0C9K6RNLD
I’m trying to find the mod cap set, but the only seller I’ve found that claims to have them in stock wants $30 to ship a $20 product, so maybe I’ll just stick with the stock 1.25U and 2U keys for now.