Have you tried leaving out some of the duplicate notes in the chords? This requires knowing what notes are under what fingers, and not just the chord form, of course. Worth practicing.

In addition, as a rule of thumb, you can always leave the fifth out of a chord, unless it's altered (i.e., #5 or b5). Standard tuning makes it easy to alternate between the fifth and the tonic in the bass.

Oh, by the way, some of my suggestions are for things that will take years to master, if you choose to practice them. On the other hand, one does see results fairly fast.

There isn't just one Dm, there are several on the neck. There are approximately seven basic forms for each chord. They are approximately seven basic forms for most scales, but the two sets don't match up perfectly. One can find them if one looks; one doesn't need a book with chord charts.

The only scales I've ever made a special point of memorizing are the major ones. I know the natural minors by heart, too, but it just sort of happened automatically. Of course, they have the same notes, just different tonics. I practice others and memorize them for the moment, but I really don't think it's necessary to be able to play them automatically, since I play by ear when I improvise, anyway. In my opinion, really knowing the major scales is enough. I _never_ play scales just as a finger exercise. I know others think differently on this subject.