I have done all of these things. Spent hours changing IP and Mac, rebooting every which way, getting my NAT to “open” via port forwarding to every damn port listed and their correct transport protocol, troubleshooting my own network with a Network+ certified neighbor and friend (I’m a Masters student in CS so I’m not totally illiterate), and it’s STILL LAGGING AND SKIPPING FRAMES.
All my buddies have given up on trying to play Season 4 because it’s happening to them as well. That includes Scotland, Australia, Salt Lake, Portland, Florida and Illinois. We’ve been on all the servers we could try... We also tried playing as local as possible and not squading up because we are all far from each other.