OK, 3rd tries a charm. Try this for the nat config:

nat (inside) 0 A.B.C.193 255.255.255.192 0 0

Also, I'm concerned with the fact that your gateway appears to be on a different subnet as your pix's outside interface.

You have:

route outside 0.0.0.0 0.0.0.0 A.B.C.129 1

And I would think that you would have something more along the lines of:

route outside 0.0.0.0 0.0.0.0 A.B.C.131 1 (not saying that .131 is your gateway address, but I would assume that it would be on the same subnet as your outside interface)

Also, you might want to run the command 'clear xlate' after making these changes and before trying to get out through the pix.

- trs