Are your BizComponents nested or peers in your BizDocument?
e.g.
<root>
<bizcomp1>
<bizcomp2/>
</bizcomp1>
</root>

or

<root>
<bizcomp1/>
<bizcomp2/>
</root>

This will help me understand how you are configuring your service so I can replicate.
Either way, you'll want to ensure that you prune the "blob" data from the results as you are returning a potentially significant amount of "data" which does not need to be displayed in the resulting XML but only passed to the necessary component(s).