I am investigating a similar topic. I came across something in the load balancing manuals that said load balancing doesn't take effect on tcp streams unless there is an EOF in the stream. There was a suggestion to look into the EVENT_BREAKER setting to perhaps address this.
I'm guessing that since the data arriving at the intermediate tier is a tcp stream that it's more difficult to load balance it.
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One of our guys figured it out:
Download and unzip the Visio file from https://wiki.splunk.com/Community:Splunk_Visio_Stencil
Open your LucidChart diagram
Click the "Shapes" gear on the left side of the ribbon (just under the File menu)
In the lower left, click "Import Shapes"
Click "Add to New Library"
Select the unzipped .vssx file from the first step
Then click "Use Selected Shapes" and they should show up in your file
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