I have a Dacor pgm-365-1 natural gas cooktop. It is not the high altitude version (above 5000'). We are at 5000'. We have a burner that doesn't work well, apparently due to high gas flow extinguishing the flame resulting in an igniter that comes on at high settings. The parts catalog clearly states that conversion to high altitude is not to be done in the field, but I'm wondering if this is true. As far as I can tell, there are no parts that are marked “high altitude” in the parts catalog. Is it possible to adjust the gas pressure regulator to improve things? Would this help? How is this done?