Oven-throttling.

My oven, as some of you already know, is...recalcitrant. Uncooperative. Inexplicable. Baffling. Perhaps even malicious.

I have tried everything in my limited power, and all my stupid chocolate chip cookies keep getting burned on the bottom. It's not so bad with dark chocolate chips, but the white ones are simply impossible.

I've got a convection (fan-forced) oven, in which I can turn the damn fan off. Fan on, fan off, lower element only, upper and lower element, centigrade range from 190 (375 Fahrenheit equivalent) to 150 for when I bothered with the fan-forcing.

Nothing helped. Some cookies were rescuable, but some just were beyond hope.

Advice? I've got a dark-colored teflon cookie pan/sheet thing. I use the higher of my two racks for baking (yes, I know the double entendres abound in that sentence). I don't have a second sheet to use as a buffer, but I've been told that might work. My thermostat might also be inaccurate (read: possessed). And since the bulb's burned out and replacing it requires a certified Mr. Goodwrench technician, I have to keep opening the stupid door to check on baking progress.

Advice? Assistance? Commiseration? No one-upmanship, that'll just make me cross.