I only store in shoe bags for my shoes that are more seasonal and likely to go a few months without being worn. For shoes in my regular rotation, I just put them on the shoe rack and brush them when putting them on.
I went with the 11UK, which is the same size I wear in Carmina's Forest, Rain and Inca lasts. The main fit issue is that I have a wide foot with a low instep and the 365 last has more volume than I'm used to.
My only prior experience with C&J was trying on the 240 and 325 lasts at Brooks Brothers and Ralph Lauren, both of which were too narrow for me. Based on this experience and the fact I go true to size for Carmina's wider lasts, I went true to size for these. The width and length is pretty close, but the volume leaves me thinking I could have sized down a half size or will need to wear thick socks.