Shell or not, it sounds like the Leeds don't fit. I don't have any shell make ups. However, I do have a couple pair of shoes that are just a little bit too big for my feet (in terms of volume). They will loosen up a little bit. That's a result of bending and flexing the leather. And your feet will sink into the shoe a little bit too as the cork miidsole conforms to your foot. I can't quantify the amount of change. I can only tell you that shoes loosen with wear to some degree.
By all means, wear them around the house for a few days (maybe use shoe covers). You made one statement that I would like to emphasize
"but spending $381 on shoes that I won't wear much because the don't feel right isn't a such a great deal."
To thine own self be true, you have to be happy with the purchase. If you have doubts, you'll think about them everytime you put those shoes on.
Have you tried an insole/insert .Superfeet makes good ones . I live in the SF Bay Area and many shoe stores have try on pairs so you dont have to buy em to find out if they will work for you . If you live near mountains ski shops have them too. They def take up room in a shoe
I think a lot of us go through this bargain hunting phase, where we try to make the great deal work. But in the end, you realize it's better not to settle on a bad fit. You'll end up not wearing the shoes. And it's better to have one pair of shoes you love that fit well, rather than two or three pair of ill fitting shoes.
I also find that something else always comes along. Maybe the correct size will come around in the outlets, or there will be something else you like. Or just spend the extra for shoes you know you will love wearing.
Thank you all for the input. That reminded me that I have some Broadstreets with insoles because they are too large also. While I really like that shoe aesthetically, I only very rarely wear them due to the fit being too large. I appreciate the validation that I should return them.