New Router, Slow Bridge Speeds

I have OpenWRT running on a Linksys EA6350 AC1200 as a bridge (with relayd). Performance has been great. However, I recently changed my wifi router from an Airport Extreme to an Orbi and all of a sudden the Linksys speed has plummeted. I am showing 880+ RX/TX on Luci, but Speedtest is only yielding ~100 mbps. It's <15 ft from one of the Orbis, so I would assume it would get close to what I am seeing in Luci. Previously with the Airport, it was 400+. No configuration changes.

Any ideas on how to improve?

Which orbi, there are several models.

The Orbi WiFi 6