Problem with CoS behavior on SRX210HE

All,

I'm using an SRX210HE running Junos 12.1X46-D35.1
I'm stumped....I've got a very simple setup:

There is ftp and http traffic going from "Remote Host" to "Local Host". I'm trying to rate-limit the ftp data so that it doesn't saturate an up-stream link that is 10Mbps. I should be able to do this at the outgoing interface fe-0/0/6.

I'm implemented CoS with an MF classifier.  The firewall filter seems to be working as expected. I can see packet counts in the proper counters for ftp data as well as when I perform an http download.

The classifier also seems to be working as expected. I also see the packet counts in queues 5 and 6 with 'show interfaces extensive' (i.e. ftp data in queue 4, and http data in queue 5).

When I remove the scheduler map,  each flow (e.g. ftp and http) receives 5Mbps as expected exiting fe-0/0/6.

When I implement the full config, no matter what allocation I give to each priority, the high priority queue stabilizes at 2.86Mbps and the low prio gets the rest.
The config here gives the low-priority the 'remainder'. But, I have explicitly configured percentages for that too with the same results.

Does anyone have any ideas?

Thanks,

Matt

Here's the relevant sections of my config:

interfaces {
    gr-0/0/0 {
        unit 0 {
            tunnel {
                source 192.168.1.72;
                destination 192.168.1.71;
            }
            family inet {
                mtu 1200;
                address 10.10.10.1/24;
            }
        }
    }
    
    fe-0/0/6 {
        per-unit-scheduler;
        unit 0 {
            family inet {
                filter {
                    output myftpdata;
                }
                address 192.168.200.1/24;
            }
        }
    }
    
    ge-1/0/0 {
        unit 0 {
            family inet {
                address 192.168.1.72;
            }
        }
    }
}

class-of-service {
    forwarding-classes {
        queue 4 my-low-prio-class;
        queue 5 my-high-prio-class;
    }
    interfaces {
        fe-0/0/6 {
            unit 0 {
                scheduler-map my-sched-map;
                shaping-rate 10m;
            }
        }
    }
    scheduler-maps {
        my-sched-map {
            forwarding-class my-low-prio-class scheduler my-low-prio;
            forwarding-class my-high-prio-class scheduler my-high-prio;
        }
    }
    schedulers {
        my-low-prio {
            transmit-rate percent 80;
            buffer-size percent 80;
            priority high;
        }
        my-high-prio {
            transmit-rate {
                remainder;
            }
            buffer-size {
                remainder;
            }
            priority low;
        }
    }
}

firewall {
    family inet {
        filter myftpdata {
            interface-specific;
            term term1 {
                from {
                    port ftp-data;
                }
                then {
                    count ftpdata-count;
                    forwarding-class my-low-prio-class;
                }
            }
            term term2 {
                from {
                    port 80;
                }
                then {
                    count otherdata-count;
                    forwarding-class my-high-prio-class;
                }
            }
            term all-else {
                then accept;
            }
        }
    }
}