No easy answer there. I wear van tts. I'd recommend 7.5. Others wear the same size for Barrie and van. You must also consider heel width. Good luck sir.
#4 shell is completely overrated. Given the opportunity, I would pick #8 or black shell stock models ANY day of the week over red shoes. Alden could produce tons of #4 if they wanted to, in fact they used to make it and it sat in stock rooms for years because no one wanted it. Other makers have #4 shell...