Unfortunatley Terraria doesn't really support high end monitors like yours properly - high resolutions and framerates often lead to strange GUI issues, and as far as I know there is absolutley zero HDR support. Sadly I don't think there are any plans to change this either.
It was pretty much the result of the huge amount of changes needed for 1.4 coinciding with the dev team's general personal situations changing meaning we had less time to work on the mod. We'd also been working on the project for around 6 years, and had ideas for new projects we wanted to work...
As far as I know, there isn't a wiki specifically for tModloader as in of itself it has no content. There are a couple of specific mod wikis on the new wiki.gg platform though: Official Calamity Mod Wiki Official Thorium Mod Wiki
Hey there @half_the_husky - welcome to the forums!
Just a quick note, if possible we prefer it when people don't post multiple times in a row in the same thread like this. Best practice is to use the edit button if you have more to add! You can also press the "quote" button, type your response...
As of the start of April, there's now a stable version of tModloader 1.4. It's still in alpha, so caution is needed but it should be reasonably reliable.
This is taken from the tModloader discord #announcements channel (Discord - A New Way to Chat with Friends & Communities):