You make some very good points. From the sound of things though you have a very good incubation set up.
Nothing fancy just a foam one I tossed together from some stuff I had laying around the house, and an $8 water heater thermostat I had to purchase and I hand turn the eggs myself... It was originally just going to be a hatcher for the last few days but it works so well it's become my primary incubator... For my own eggs I get 95% to 100% hatch rate out of it, from other 'local' eggs I pickup myself I get about 90% to 95% hatch rate, shipped eggs are so hit and miss I don't factor them into the incubators performance... I have had 100% hatch rate from shipped eggs and 0% from shipped eggs, with shipped eggs and all the variables on how they were handled prior to getting to me it's really a very poor measurement of an incubators performance...
Either way I'm in the process of designing my own custom computer controlled incubator for next year... It will be pretty much fully automated, temp, humidity and even have an all day random egg turning feature to mimic the randomness a hen does all day while sitting... I expect it to perform quite well when done...
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