B17 comes in a narrow version, that's what I have. I got one this spring, and put about 2k kms on it so it's pretty well broken in now although I didn't find it particularly uncomfortable from the start. It's still not as comfy as my SLR gel flow though (which is my favourite of all my saddles), although I expect it will last longer.

Pizza: I'm usually a scale guy when it comes to bread, but pizza is pretty forgiving IMO and I don't usually bother. It's more about how you treat the dough than what goes into it. Letting it rest sufficiently while working it and stretching rather than rolling makes a superior pizza in my books.

My recipe:

4C flour
2.5 tsp instant yeast (no need to proof this either- you can mix it into the flour)
1 tbs sugar
1.5 tsp salt
2 tbs olive oil
1.75C warm water.

It works out to something like this: