As mentioned before in this thread, track bars have that smoother top curve for the very purpose of sprinting in the drops. Roadies don't use the drops as much when out of the saddle--they're mainly for descents.

Riding the tops of track bars takes a little getting used to, and is a bulls**t experience on a stick if they're not wrapped (or have grips on top), but it is nice to be able to use the drops without your arms hitting.

Look into Nitto track bars, or Deda Elementi, or 3T, or Eastons if you're feeling ritzy.

Edit: as for the shoulder width, yours sound pretty wide, and I know that Nitto B1243/5 come in a variety of widths--try looking at a fit calculator such as the one at www.wrenchscience.com to determine the ideal width. Or measure out a mock-up and do some comfort testing.