I've seen the nozzle damage you described in another thread. Was it confined to the area of the nozzle that's exposed to combustion right around the needle, and not under the area sealed off by the heat shield? That's how I've seen it.

NOTE: I took a look at the pics you supplied here:

http://www.peachparts.com/shopforum/3969582-post1.html

The nozzle damage seems pretty well confined to the area that is exposed to combustion.