Good catch,

Inteface QoS is enabled on the other side of the trunk, something I hadn't known about/looked at before:

cs-2-1-1#show qos inter gi1/1

QoS is disabled globally

Port QoS is enabled

Administrative Port Trust State: 'untrusted'

Operational Port Trust State: 'dscp'

Trust device: none

Default DSCP: 0 Default CoS: 0

Appliance trust: none

Tx-Queue   Bandwidth   ShapeRate   Priority   QueueSize

             (bps)       (bps)                (packets)

  1        250000000   disabled    N/A        2336    

  2        250000000   disabled    N/A        2336    

  3        250000000   disabled    normal     2336    

  4        250000000   disabled    N/A        2336    

cs-2-1-1#

However, how would enabling QoS on the far end affect Output drops on the near end?