Quote:
BiaB treats the first intro bar at a faster tempo than the rest of the song. If I change the whole song to a 111 tempo, it throws off all the timing. What is the "correct" way to represent those first 5 notes or so in this song?

Firstly, Welcome.
Zooming in on your screen capture I see the tempo is set at 213 (see screen capture extract below).
It is possible to change the tempo at any bar by selecting that bar and pressing function key <F5>.
Perhaps you have inadvertently set some bars, or the Song main tempo to a different tempo?
Suggest that you set the Song Tempo to 111, and then use <F5> functions to 'Reset ALL Bars' (unless you have other changes within the song). That might hopefully get you back on a level playing field. Hope this helps.

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