I'm now getting freezing after about 15-30 mins of flight 99% of the time. (Clean community folder)

Check Nvidia driver version. Also with such a “KICK aS#$” $7000 PC you may find you need to raise resolution/scaling even more than in options by editing UserCfg, the only problem then is that servers might not keep up if you don’t lower LOD. Sometimes I’m just glad I only paid a quarter of that.