I've always found the Wacom tablet surface to be way to slippery for accurate drawing control, and your solution with the drafting mylar is exactly what I've done. I have it on my tablet all the time, and it gives me the right feel and control for drawing that I want. I thought at first about actually taking some sandpaper to the surface of my tablet, but they mylar works perfectly.The second thing I did, to provide a really "slow" paper like texture is to get a piece of "single matte" mylar - the kind I used to use in pen and ink drafting - available at the rapidly vanishing brand of small art store - cut it to the exact size of the screen - tack it at the four corners with thin, double-sided tape, matte side up. This surface, combined with the use of the pastel blending stick, is about as "slow" as it gets. I only use this on the final inking pass and can achieve super steady lines and see enough of the icons and text within the program to get by. I wouldn't want to work through this haze all the time, but for finished line work it cannot be beat. It's a very inexpensive solution which also works on a regular Wacom tablet surface.
jack