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@Bill_Brown and @Marty69 and @Kitman ;
Cmaj7 has a major 3rd and major 7th. Cm7 has a minor 3rd and minor 7th.
The key of C uses a Dm and a G. C and F are major.
The key of Bb uses a Cm and Dm. F is major and G is minor.
The key of Eb uses a Cm and Fm. D is diminished, G is minor
Cm7: C, Eb, G, Bb
Dm7: D, F, A, C
Fm7: F, Ab, C, Eb
G: G, B, D
Eb has a Bb, Eb and Ab that occur naturally. The G is your 3rd degree, and it is common to turn the minor chord into a major chord. The D, being the diminished, would work using a Dm7 instead.
I would try using the key of Eb to solo over this.
However, the sound will always win. Whatever sounds best to you is what is right.
I thought you did a good job with your solo, @Kitman , but I do think there were a few notes that sounded out of place. The above should help you to see what notes to avoid over what chords. Over all, I think Eb would be the easiest.
MG 😀