Mills I see your problem right off. Way back in the day when I hunted ducks and geese I used to hunt a beaver pond that was just across from where I lived. The perfect gun was a Remington 1100 20ga with skeet chokes. The Mallards came in feet down and the shooting was fast and close.
Your more open areas (here we have some mgt units on Saginaw bay which is big water) you need more choke.
The solution is multiple guns suited for the venue you are going to hunt. It's no different with Grouse. I have the early season guns and use a more tightly choked gun for late season. The simple anser is more guns Mills more guns.
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