So I decided to see how far I have come. This is the first time I've done a "head to head" before and after look, and I thought I'd put it up to give people some hope.
I went back to notes from my MBA courses in 98, and pulled out this exemplar.

This was my "fast" cursive, combined with problems done with my "neat printing" (I'm an engineer so always preserved some sort of printing in my repotoire just for math work). The "fast" cusive was really a mixture of print and cursive forms, and incredibly small and compact. But what gets me is the illegibility.
In 2000-2001 (after I started collecting pens) I decided to fix it. Bought the Sasoon book and spent 4 months "retooling" my hand. This is the result. I rewrote problem #3 today, as absolutely fast as I could write,and I mean it was fast.

Is it perfect, NO. But it's very legible, and very functional, and it is still personalized. I probably wrote this passage faster than the original. I have to say, I was pretty surprised to see the difference, even though I knew there was one.
So, take heart, all of you who want to improve. It is possible!!!
(shucks, I have to say I'm a little proud...