Cisco Switching/Routing :: 3750X / QoS Preservation Of Markings Between Two End Systems?

I have a requirement to preserve markings end to end across a network utilising 3750X switches, I am marking the packets without a problem, but due to the rewriting function the marking is being overwritten by ther COS-->DSCP maps.To simplify the scenario I have set up a test environment (see Diagram) and am using ICMP as a simple test using ICMP to test with Both 3750 have 12.2(35)SE5 3750-1
 
mls qos
mls qos rewrite ip dscp
 ip access-list extended ICMP
permit icmp any any
 Class-map ICMP
match access-group name ICMP

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I have used wireshark to verify that the packets are being marked, with the' mls qos rewrite ip dscp' they are, without rewriting does not occur.Moving my sniffer to the 3750-2 I am monitoring the Layer3 connection (marking preserved), however on the layer 2 trunk the marking has been reset to 0 , if I remove the 'mls qos rewrite ip dscp' from 3750-2 then I see the marking on the layer 2 trunk, however I am then unable to remark anything generated on this switch. I believe with the 'mls qos rewrite ip dscp' enabled the L3 to L2 transistion removes the IP DSCP sets the COS to 0 and themnthe COS to DSCP mapping ensures the DSCP is set back to 0.I have tried implementing additional marking policies on 3750-2 but to no avail.What I need is ensuring that that a frame / packet marked in 3750-1 can keep it's marking to the end system over layer 3 and a layer 2 trunk. The only place I wan t the marking to be stripped off is when the dot1q tag is removed as it goes through an access port.