I guess you already figured out that some brands run wide and others narrow. I'm leery of buying online, but if you have researched what they actually measure, then perhaps you'll fair well online.
I wear very thin socks with my shoes. Most shoes are so well shaped and/or padded inside that additional padding from thick socks is more of a negative than a positive for me. I also will have some swelling in my foot right over the pedal after about 35 miles of ride that annoys me some. If hydrate a little more and keep going, it disappears after another ten miles and usually doesn't bother me again for the ride.
I also wear a Pearl Izumi mtn bike shoe in the summer. Don't remember the model name, but it's mostly a mesh so it breathes very well and you can feel the cooling from the air flowing through. Pearls run narrow though, so maybe not for you.
Last edited by Iride01; 06-26-18 at 10:52 AM.