Was just testing band locking to exclude B3 so happened to run a few speedtest.net runs to check for performance and feel there's high variability based on the target server so thought I would record some evidence.
Above was LTE B7/B7. Went back to Auto and hoping to get B7/B3 back (mainly to improve latency) but instead two restarts give me B3/B3 on the slow mast.