Are you still located in Rapid City? There is a Weimaraner breeder in SW Nebraska that you might call. I personally know nothing about this breeder, don't even know if tthey are still in business. But you might try giving them a call...
You probably couldn't find a worse place in South Dakota for bird hunting. Unless you want to drive 100+ miles east or north of the Deadwood/Lead area. Also, that time of year in that area you could have a fair amount of snow.
https://www.crispiusa.com/upland-pro?size=8&width=d&color=brown
Let me know how they work out. I may may need a new pair of boots this fall. I've got hard to fit "old feet". Glad to see they come in a EE width.
I know the quail are way down in Arizona due to the extreme heat and dry conditions the past couple of years. That could also effect southern Utah. Where are you saying pheasant number are also down?
No, I don't think an once or an once and an 1/8 are the same coming out of a 12 or 20. You are trying to squeeze the same amount of shot through a much smaller tube which can effect your pattern. The usual 2 3/4" 20 gauge shell holds 1 oz. of shot versus a 12 which normally contains 1 1/4 oz...
For eye protection I have been wearing these glasses from Stihl for years. They come with various color lens. Lightweight, fit well and can't be beat for the price.
https://www.stihlusa.com/products/protective-and-work-wear/eye-protection/slgls/