I thought of one other author that is worth looking at is Rowson. His books really are full of original thoughts and are excellent. They may be aimed at a slightly higher rated audience. Also Watson's two books are great but they are also targeted at a higher audience,
If Descriptive Notation is tough to play through i would look at another book as working through notations that give you problems can slow down and impair your knowledge of the material. I do not think there is one book that is much better than any other.
I think Modern Chess Strategy is probably very worth reading even with the mixed notation. Just an annoyance to deal with more than anything.
What I would really like is to see the his 3 volume series republished by someone.
Edit: I started reading through some of Pachman to see if it was actually a pain to read with the switching of notation and it isn't bad. So if you are used to both types of notation I wouldn't worry about it.