Workflow Launch Handler and UWL

We have the following scenario: Multiple portal servers pointing to a single SAP R/3 HR Instance (4.6C). We are using Business Package for MSS and must use the Workflow Execution Handler (WFX) due to some customisations we have made. As part of the WFX handler configuration the component publishes the WFX URL to the backend system, but since we need to do this for 3 portal servers, each time it just writes over the last entry in the backend. We end up with the wrong URL in 2 out of the 3 portal servers. Has anyone else experienced a similar scenario/problem? Any help or experience in this would be greatly appriciated. I have also raised a message on OSS concerning this.