Hi Amber
Going off on a tangent, I'm just curious why the responses have been marked as helpful when they have only led to confuse you 
Refer to my comment in the following thread on appreciating someone for taking time to answer your query but the response was not helpful to the situation.
Re: Success factors - PI SFTP Public Keys For Private Key Based Authentication
IMHO, you don't need to mark every single response to your threads as a helpful answer. It is better that you just mark the responses that really helped you in your particular issue. Doing so will also help others who encounter the same issue in the future and come across your thread to zoom in on the really useful responses. Marking everything as helpful (especially when they are not) will confuse others in the future, plus it might encourage others to just simply reply to your threads with irrelevant answers in hopes of getting points. You will end up wasting your time and effort in going through all these answers which might be of no use to you. If you want to appreciate someone for taking time to answer your query, but the response was not relevant to it, you can just hit the Like button.
Anyway back to your issue, IMHO, I don't think you should be spending your time on the SOAP-Axis polling method. It only allows for static definition of input parameters.
However from your screenshots it looks like your intention is to pass parameter values dynamically. If that is really the case, it's better for you to go for the Proxy to OData/SOAP approach with the async-sync bridge. And since there is an existing SOAP webservice available and you do not currently have the OData adapter, why not just go for the SOAP based approach.
Regards
Eng Swee