I have (I guess) rather normal size 38 feet, and own Sidi, Shimano mens, Shimano womans, and Specialized shoes.

I find the Sidi to be both the narrowest, and the smallest, lengthwise. Whereas the Shimanos and Specialized are about the same length, the Sidi is shorter and I find I can only wear them in summer with thin socks (guess what time of year I bought them...)

So I don't wear the Sidis, which is a shame, because they are made very well. The Specialized feels to be maybe slightly narrower than the Shimano womans, and feel fine for my B width feet. The mens Shimano is about the same width except for the toe box, which feels a bit taller. So I would say, yea the Sidi would work out better for you than the others.

I do use LG footbeds in some of my shoes and find they take up quite a bit of space, as well as being very comfortable as they are heat molded to shape (easy to do). You might want to look into something like that before going with custom orthotics.