I've been really happy with the wheels. I don't really think there was much that could help with the rolls, the first was pretty much end over end so track width wouldn't help much. The second was an up in the air bounce so again, no help. The weight of the steel wheels might have helped, that was probably the problem, the alum. wheel were so light they flipped me right over!
I've never been a real fan of a lot of tire outside the fender or really wide track widths, I think where I am now is a good balance of width for stability and narrow for better fit. That's why I have the 16.5's to start with. Incidentally, the alum wheels are backspaced 5 1/8" so I ended up 3/4" narrower when I swapped over, which I really didn't notice except my locking hub isn't as far inside and my coil and link arm clearance isn't as big as it used to be.