Nice work, slater!
I've found the same thing for my swing. I'm a club shorter than I used to be, but I've got this nice slow takeaway, a nice turn of the hips (no sliding!), and a wonderful trajectory. I no longer feel like I'm trying to hit from the top. I simply load up on the backswing, and turn left. The ball just goes. It's so nice. Effortless power. The trick is to keep swinging like that.
Way to go on the 78!