The more I think about this, this more I'm of the opinion that this verse sets out not to have an easily identifiable tonal centre so that when the song arrives at the chorus, the sense of 'home base' is amplified and felt strongly.

I found the image below of a version that's written in the key of G major. The chords you give are a minor third lower than the chords on this music. This suggests that your chords are in the 'overall' key of E major.

Notice how the at the bottom right of the below image, there are two flats in the upcoming key signature (this suggests Bb major) and the last chord is F7 (which leads to Bb major as a V-1 progression).

Interestingly if I go down a minor third from F7, I get D7 (the last chord in your above post). Also a minor 3rd down from Bb is G -- also in keeping with your post.

So... using the image below, your chords would seem to be in E major but drifting every now into a slightly hinted key of G.

You might find that you get better results from BIAB if you set the key for the verse to E and the key to the chorus to G. My experience is that such settings help BIAB isolate which chords will work best.

Regards,
Noel

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