QoS traffic management with 5130

[Gustaf]

I have one ISP connection with 100 Mbit. I would like to shape the traffic on some ports of the switch and guarantee these ports a minimum of traffic, same ratio in- and outbound.

So I have four connections on the switch. 1: ISP uplink, 2: device A min. 20 Mbit max. 50 Mbit, 3: device B min. 20 Mbit max. 50 Mbit and 4: device C min. 50 Mbit no max.

My configuration looks like this:

interface GigabitEthernet1/0/1
 description ISP
#
interface GigabitEthernet1/0/2
 description device A
 qos lr inbound cir 51200 cbs 3200000
 qos lr outbound cir 51200 cbs 3200000
#
interface GigabitEthernet1/0/3
 description device B
 qos lr inbound cir 51200 cbs 3200000
 qos lr outbound cir 51200 cbs 3200000
#
interface GigabitEthernet1/0/4
 description device C
#

All traffic is in the default QoS class. I have two problems:

A: The download speed is max. 50 Mbit but the upload is 4 Mbit, not the 50 Mbit it should be. 
B: Has anyone an idea how to configure the guaranteed traffic for the interfaces?