I know your concern about too much room in the toe. I have found that rarely has a little extra room in the toe caused me any issues. I had to size up a half for my macneils and I was really concerned but in the end they ended up working out just fine. I have a slightly larger right foot as well so I have to size for that one. For me anyway, I've had lots of shoes that were slightly small that I hoped would stretch out...and never did. OTOH, the few pair I have with a bit of extra room in the length have always worked out well.
Just one man's experience but it may help.
I have one of those weird sizes where the ball of my foot to the heel says I'm a 12 while the length says I'm an 11. So I usually find 12s are a better fit for me. The only problem is that I tend to get creases in the toebox because of it. I'm trying various counter measures, though-- such as stuffing the extra toe space with newspaper. Seems to work so far.