You use the very old stack.
May be, one of these bugs are the cause (these were fixed since your revision):
[JBWS-1736] - MTOM property at service-ref level
[JBWS-1460] @XmlMimeType on SEI parameter declarations
[JBWS-1973] - MTOM/XOP attachments not inlined when using JAX-WS handlers
[JBWS-2000] - MTOM: Chunked encoding transfer problem
[JBWS-2012] - Attachment support for JAX-WS collections
[JBWS-2014] - MTOM + WS-Security not working
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