I have the VERY same problem in our 2009 AF 811.
We used to have an older set of cookware. Roughed up aluminum stuff. Last year, we were given a full set of Calphalon (sp?), nearly new condition. So we donated the old aluminum set. First trip out with the new stuff, I dang near lost a pot of spaghetti sauce onto the floor about half dozen times. I soooo regret my decision to donate that old set. Definitely wish I had it back.
There's no way I'm roughing up the grate on my camper. I tried hitting the bottom of the pans with various grits of sandpaper but haven't had much success. Calphalon has got to go. Looking for an older set again.