So it's been a few days. Generally got 30fps and never had any heat issues or instability.... until today (Nov 27 2020). No idea what changed but now it won't even start the application. I go to console (Mac app) and check the logs and find multiple lines of the following:

Coalition Cache Hit: app<application.com.squareenix.finalfantasyxiv.2337573.2337751(501)> [26578]

I don't pretend to know what that means but it doesn't even open the launcher anymore. Not sure if I messed up the rosetta 2 emulation settings for it when installing other things or if square ran an update and the latest version of the launcher doesn't work with it... either way I'll keep looking around for a solution but I'll be using my windows desktop for FF14 until this is resolved.