I play it as a downstroke because then my pick is on the next string to play the sixth note. There is a lick that is almost the same in Minor swing Bar 16 and it is written as a downstroke there to.
I have a Gonzalo Bergara recording where the rhythm player stays on G7 for both measures and a Bireli recording where he plays it in the key of G so the rhythm guitar plays 2 measures of D7 at those measures but I also have seen a lead sheet where it goes Dm7 G7.
Slower backing tracks would be nice. In the meantime I've been using Transcribe. http://www.seventhstring.com/xscribe/download.html It's great for slowing things down. You can get a 30 day fully functional demo to try before you buy.
I spent a lot of time practising scales because I thought you needed them to play jazz. When i joined this site and started learning licks and parts of the solo's it hit me one day that this site's approach is the same way I learned to play blues/rock. I learned that style by learning licks and solos not by playing scales. Now when i practise improv. I get out a chord sheet to a gypsy jazz tune and play licks that fit over the chords and parts of Stochelo's solos and try out a few of my own ideas. I think all that time I spent playing scales was a waste of time. I could have been playing music instead of mind numbing scale exercises. Playing scales might loosen up the fingers a bit but learning licks will do the same and you have something useful you can use in a playing situation.