When I was in my forehand throwing heyday 20-25 years ago, conventional wisdom was to throw something overstable. We had Whippets and X-Clones and Banshees, among others. The rims weren't wide at all by today's standards. I usually only hyzered with them, and was pretty good at flip-hyzering a Banshee that had hit three or four trees for some distance that was serviceable in Am-1.
Now it's common to see good players FH all sorts of kinds of Discs at all the angles. Even midranges and putters! There weren't many of us in the old days who did it.
That rim width corresponds with the speed the Disc needs to do what it's designed to do. I'm of the opinion that very few players ought to be throwing high-speed drivers for regular air shots. Unless you're really good, you're going to be more accurate with a slower driver, and the difference in distance between the two is negligible until you are good enough to capitalize on it anyway. (It's a different story if you use a fast driver on purpose when you need a skip on a trick shot...)
I don't do well above speed 9 personally (Valkyrie, Sidewinder, Thunderbird, etc.). I might get another 20 feet out of a Blizzard Destroyer but there's a good chance it's going to be at the expense of control.
I'm all backhand now, by the way. All those forehands in the nineties with not-so-good form using brute strength took its toll on my elbow and it alerts me with some pain when I try forehand drives today. It's easy to screw up something in your shoulder or elbow if your forehand form isn't good, so be careful there!