mxe.oslc.webappurl is the only system property you would need to change for this. The property is supposed to end in /maximo/oslc/ though, not /maximo, which is why you're likely encountering the issue. This is because it needs to replace the trailing /oslc/ with /api/.
I wouldn't use it here, but in situations that you expect a different URL to be provided then the system property value, you can add a query parameter to all requests of relativeuri=1. This simplifies the href being returned.
In 9.1 of MAS, there is a setting (enabled by default) to set these via server bundle properties.
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Steven Shull
Naviam
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