Alright, so I did this, and 160Mhz now works. Thanks!
- opkg remove kmod-mwifiex-sdio kmod-btmrvl mwifiex-sdio-firmware
- remove the radio2 section from /etc/config/wireless [I commented it out]
- keep both radio0 and radio1 country set to FR [had it set to "driver default", change to FR was required]
- reboot
Then I enabled "force" for 5ghz and changed from 80Mhz -> 160Mhz. For 2.4Ghz I can still use both 20Mhz and 40Mhz, and I do not need to have "force" enabled on that band.
I'm on WRT32X (r22497)