Thanks for those tips. I definitely feel like I'd like to get a better grasp of FTPro and Wilbur, so I'll check those out. I've been playing around with incise flow and fill basins a fair bit but I'll try and see what an exponent does too.

Also, I didn't know that the tutorial was by a2area, so I'll edit that first post to credit him. It's a brilliant tutorial and it's teaching me a lot.