I am currently re-editing these arrangements. They tend to sound best when the first couple measures are in the natural minor, then some accidentals may be added for the next three bars. When descending, the first two bars are best in natural minor then it may go through some modulations, then it return to natural minor at the end. There are actually many ways you can do it. Playing it all in the natural minor is really boring.

@@BachScholar I was trying to do the melodic minor, that means using the raised 6th and 7th for all the ascending fragments and the natural minor for all the descending parts. I'm not sure if it's a good way to do it, but it seemed the most logical thing to do. At first I thought that's what you were doing, before realizing you're mixing the two scales. I also was confused by the fact that you're using sometime the melodic minor for the descending parts.

Great idea.