ffxiv-tools VS hudkit

Have you read this guide?

ACT - https://github.com/valarnin/ffxiv-tools/tree/lutris-xivlauncher

There's an act installer. Last I knew the overlays were not working as well as cacbot (I really wish cacbot would just die anyway). https://github.com/valarnin/ffxiv-tools/blob/master/Guide.md As for a guide, I'd rather not. You should check out the gshade installer instead. https://github.com/HereInPlainSight/gshade_installer

This is the guide I followed: https://github.com/valarnin/ffxiv-tools/blob/master/Guide.md

Getting ACT to work is tricky, but it can be done. The key is to install it into the same prefix as your FFXIV installation, get the various .NET libraries it needs installed, and run it using the same runtime that you're using for the game. In addition, you will have to use setcap to enable certain capabilities for the wine runtimes, as ACT relies on directly reading network data from other processes and wine is restricted from doing that normally. There's a scripted tool that handles a lot of this, although it's a bit dated so I don't know if it still works -- I used it as a guide to manually perform an installation myself: https://github.com/valarnin/ffxiv-tools/blob/master/Guide.md

ACT Overlays will always perform badly because of how wine handles transparency. It's recommend to use something else for overlays like hudkit or imgoverlay or just plain out normal browser window and use the overlay plugin to generate a URL in Plugins -> OverlayPlugin WSServer -> URL generator at the bottom that you can hook into the said programs. Dalamud overlays work fine because they draw into the game window itself instead of using window transparency but if you aren't using DXVK async they do cause a little bit of lag too. FFLogs has a native Linux client so it just works with no glaring issues.

As the guide mentions, using hudkit (a native linux CEF wrapper) will allow you to display overlays. If you instead want to use an inlay, use NextUI. browsingway does not work on linux.