Thanks for the great information, it's always nice to get advice from people that work in the trade. As I said, I don't have a manometer, but I would imagine that setting the gas flow by the meter would have brought it pretty close to the optimal setting. As far as dust buildup on the evaporator coil goes, I never thought about that. I'll have to stick my head in the blower cabinet and see what's going on in there. It's due to be vacuumed out anyway.
Since I adjusted it its been cycling about 4-5 times per hour, about normal for the 30 degree nights we've been having lately. Still a little too sensitive for my taste but that will have to wait until I can get a new t-stat.
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