Sometimes even after you turn things off you need to reboot several times. I had a nightmare getting FA to turn on on mine, and since it did have barely dared touch anything (although I only use it as an AP now not a router).
Some info here:
https://routerguide.net/nat-acceleration-on-or-off/
There is a page that shows you what is enabled, on mine it's here:
https://imgur.com/C1YQrLu
Both CTF and FA are needed, without either you won't get more than about 80mbit, CTF will get you to around 200, you need both for more.