Please see below for F#/Gb Major Harmonic four note chords which I made. You will notice the fourth degree shows as a min/major 7th chord (which doesn't sound too bad). But, what is considered a good substitute for this min/maj chord? I ask as in minor harmonic chords, generally the 1st degree min/majo chord is usually substituted with a minor chord from what I have read, thanks.
Edit: Note: I've replace the previous layout which had incorrect spellings for Cb (B) and Ebb (D), thanks for the advice everyone!