Your response leads me to wonder if you've adjusted your simmer flame. Each burner is factory preset a little high to anticipate the fluctuating norms in pressure and gas composition (combustibility) throughout North America. This process takes about five minutes with a flathead screwdriver. For instructions, view the 3-minute video "Burner Flame Adjustment" online at http://www.frenchranges.com/support
As an interesting aside, I've been amazed several times witnessing the bond a chef has with his stove. Often, they prefer to tinker with their stoves personally to become more familiar with its secrets, rather than intrust this to an outsider. As a new Lacanche owner, I'm enjoying all facets of ownership, including the discovery of "what's under the hood".
ps... I found an incredible set of Italian-made stainless cookware with copper core at Costco for $199. This was recommended to us by Mike Duppenthaler of the Blue Ribbon Cooking School in Seattle. Visit http://www.blueribboncooking.com
to learn about their excellent programs.