Thanks guys, I see now that the 6th added to the minor chord is the same as its preceding dominants 3rd.

As far as maj.6 chords, I hate them and never use them. Never gave them much thought cause they always sound so "cheesy" to me.

There was 1 time I discovered a maj.6 chord in a progression which I thought sounded really good, I believe it was the end vamp to the Chili Peppers "Under the Bridge".