Cisco Infrastructure :: 1921 / Implement Dynamic QoS Between Two Sites Across Low Speed WAN Link (512k)?

I have a trouble to implement dynamic QoS between two sites (Site A, and site B) across low speed WAN link (512k). On each site I have Cisco 1921 router. Most important app is Oracle. Because of slow speed WAN links, I want to avoid exact bandwith reservation for Oracle. I only reserve 5% bandwith for network control(icmp, ssh, telnet...) and want configure next Qos scenario:
 
1. If Oracle traffic exist on a network, it must have 70% of link speed guaranteed, all other apps (e.g mail, file share, ftp) use rest of the bandwith.

2. If there isn't Oracle traffic on a network, all other apps can use all available bandwith.
 
Issue descrtption:I used all Cisco guides, but when I implemented this on production it simply didn't work. There is no any significant improvement after implementing this (when I start network file sharing accross wan link, Oracle becomes etremly slow.).Here is configuration wich I trying to implement:
 
ACL-s and class-maps used to mark traffic:
 
access-list 119 remark ###QoS-MGMT###
access-list 119 permit tcp any any eq 22
access-list 119 permit tcp any any eq telnet
access-list 119 permit icmp any any
access-list 120 remark ###QoS-DB_ORA###

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