PG Product's Realband program comes with a feature called Audio Chord Wizard .. which sounds like it is to analyze chords (which it does) but it is even better at adjusting a Tempo Map.
It comes free with your BiaB purchase.

It is much simpler in that you can either:
Play the song and tap the F8 key on the one of each measure to adjust, or
Drag the bar line to align where you want it.

Both of these options are available after Realband has already ran through your song and adjusted the Tempo Map to what it sees .. and it usually gets pretty darn close on its own.
And it gets pretty granular .. down to tempos like 121.344356.

I do not work here, but the benefits are still awesome
Make your sound your own!