You may have better luck using the MIDI Chord Wizard, which you can access from File > Import > Import Chords From MIDI File (MIDI Chord Wizard), or press Ctrl-Alt-I. The "Pop (w/7ths)" preset seemed to be the most accurate, though it's detecting the 9 chords as 7 chords. Chord detection will only write chords on the quarter notes, however it will still detect chords that are not played on the quarter notes (as long as the notes are held over the quarter beat).

As well, you can enter those chords into BB like this, without having to use Microchords:

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Preceding a chord with a caret ^ will push the chord an 8th note early, and two carets ^^ will push it a 16th early. This automatically takes into account whether the style is swing or even.

If you prefer to use Microchords, this is how one bar would be entered:

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You will get different results with Microchords or with the main chordsheet. I suggest trying both and seeing which sounds better to you.

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