Re: improving jazz improv skills
Yes, that's it. Those tunes are fine.
The point is, that when you come upon a chord change, say Dm7, you should be able to look at the neck as a palette that pertains to that chord. To see all the chord tones is the first step.
For years I used to jam along with Jamey Abersol music minus one Cd's. There are tons of them. Live jazz musicians were used, so the feels are excellent.