qfx5100 VC multicast traffic BW allocation

Hi community,

we have a VC built-up by x4 Juniper 5100. Mos of the traffic crossing this platform is video mcast traffic and we suspect of mcast traffic lost. Client servers are connected via 10G ports but we also have a probe system connected on a 1Gb port. For this interface we are suffering some lost of traffic on the end system, and while checking the interface counters i saw that around a 0,6% of the mcast is being dropped:

Queue counters: Queued packets Transmitted packets Dropped packets

 8                             0                             3071553518              19857689

Queue number: Mapped forwarding classes

 0 best-effort
3 fcoe
4 no-loss
7 network-control
8 mcast

coS information:
Direction : Output
CoS transmit queue Bandwidth Buffer Priority Limit

8 mcast 20% 2000000000 20% 0 low none

As mcast traffic seems to use up to a 40% of the total BW, i wonder if this can be changed or not as this interface is mostly dideciated for cast traffic. i tried to assigned a different FC but not been succesful. )

any help on this is appreciated.

Thanks

Gab