The DSCP tagging is wrong. It should be : Expedited Forwarding (EF)
This will only help if there is congestion on your network and if the next equipement ( routers , switch and so on ) honor the DSCP tagging.
On your MX , do you see any latency or packet loss ? :
![RaphaelL_0-1660242647901.png RaphaelL_0-1660242647901.png](https://community.meraki.com/t5/image/serverpage/image-id/24850i1AC227FA201A0468/image-size/medium?v=v2&px=400)