No, CZ, it's not a matter of fit, as far as the usual measurements go...............DAC, LOP, stuff like that. I will admit that I don't care for the angle my wrist has to be bent at to "properly" grip a straight gip stock. Pistol grips were designed for a reason. They allow your wrist to remain straight when you are gripping the gun and your finger is on the trigger. So, if there's anything that doesn't fit, it's that my body just doesn't fit, or doesn't like, a straight grip. Now, with a tiny lightweight gun like the .410, I'm fine. But, at the same time I'd rather it be a pistol or semi-pistol grip. But, in all honesty CZ, there's a lot of difference in the recoil of 1 1/8 load at 1200, and a 1 5/8 load at 1250. 
I'd never try to convince a shooter he shouldn't shoot what he likes, but the next time you grip a straight grip gun in your house, look in a mirror at the way your wrist is bent in a sharp angle to hold it. That just is not conducive to the best control of heavy recoiling loads. Nash was a much bigger and stronger man than I, and to read his books he could shoot mighty good, but that doesn't mean it's right for me. It isn't. Glad others like them so much.
 What it boils down to for me is this. I like to kill doubles on doves and ducks...........and true pairs. I accomplish that much "handier" when I can get on the second bird very quickly after the first shot. A pistol grip allows me to do that faster, especially with heavy duck loads.
 My MX8 weighs over 9 lbs. and has a GraCoil on the butt. It was on it when I bought it, so I gave it a fling, and loved it. Why? Because it tames what little recoil there is from a 1 1/8 oz. load at 1150, and gets me on the second bird of my true pair faster. And, most of all, the lack of gun movement in recoil doesn't take my mind off what it is supposed to be on..............where that second bird is.  I averaged 93/100 on all the sporting clays targets I shot last year, registered tournaments,and unregistered,..............with O/Us and with S x Ss. Yes, Jon, I try to get one more target per hundred any honest way I can.
 I'm enjoying the comments and banter. Many good thoughts.........SRH