Just updating this a bit for anyone googling along. I tried a not-listed Shimano Ultegra 6500(it was handy) and it just seems impossible to adjust it to where I don't get chain rub in either cross-chain condition so I'm going to pick up one of the suggested PNs in this thread and will give it another shot.
On a related note, however, I'd like to upgrade the front chainrings due to accelerated wear on the stamped steel models that are currently installed as well as the fact that I will never need a 54 tooth big ring and I'd like to make the transition between rings a little less of a struggle.
I was wondering if these would work for me. I am wary because the stamped steel big ring is dished somewhat and these seem flat. I wonder if that will change the spacing between the two rings. I'm hopeful that I can move the big ring in a bit toward the center of the bike as the current big ring-big cassette cross chain is causing problems riding. I think the current chainline is pretty poor.
Thoughts and suggestions would be most welcome, thanks for your time!