As you can see the values come through separately.
I would suggest the following...
After the IBM iot node, put a switch node to test msg.topic is == to one of the 7 topics you are interested in. Then feed all 7 outputs of the switch node to a join node set for manual mode, key/value mode, 7 parts, subsequent values.
Once you have that working you should see all values in one message & you can used the "copy path" method I showed you before - to build 1 object.
See this article in the cookbook for an example of how to join messages into one object.