Hi,
I would suggest looking at the classifiers applied on fe-0/0/1 on SRX and correlate that the traffic is entering the correct forwarding class on SRX2:
show class-of-service interface fe-0/0/1
Also, you could possibly apply an L2 filter on fe-0/0/1 SRX2 and match for learn-vlan-1p-priority=010 to verify that frames are indeed coming with 802.1p 010.
If you could share the CoS config, might be helpful to understand better.
Cheers,
Ashvin