I was able to solve my own problem, but thank you!
In the off chance that others may need this same solution, here is what I did to fix my problem:
Right click on the book in Calibre and select Tweak Epub and explode Epub. Find the content.opf file and open in notepad, in between the <guide> tags, insert <reference type="start" title="Start here" href="starthere.html"/> (with starthere.html being the file you want to open as your default "beginning" which in my case was split_000.html). Save content.opf, go back to Calibre, click Rebuild Epub, convert to mobi and transfer to your device.
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