Honestly the only way to tweak these kind of things is live with them.
I added a super secret param so you can stick a site customisation, so for example:
https://meta.discourse.org/?preview-style=589a2b8f-237f-4408-b86b-2d5f158b22b6&sticky=true makes my theme sticky for me, so I can live with it for a bit and see how it goes.
To disable either delete cookies or simply go to https://meta.discourse.org/?preview-style=