I bought two of these units to replace my unsupported Ruckus gear and was bummed to run into this.
Switching to the non-ct driver allows me to transmit at 80mhz and give me comparable speeds to the AC1750 ruckus gear. This is a 2-3x improvement over the default ct driver in my testing.
I'll add this here since I had to dig deeper to find it. Works on 22.03-rc5
opkg update
opkg remove kmod-ath10k-ct ath10k-firmware-qca988x-ct
opkg install kmod-ath10k ath10k-firmware-qca988x
reboot