I agree with you on the malpositions r/t the turner rolling the eggs pointy side high. I never had breech babies until I had an incubator with a rolling floor. So twice a day I just manually straighten all the eggs again, and for lockdown I prop them all up at a good angle to hatch.
Problem with the uneven or inconsistent heating can be corrected by laying a piece of bubblewrap over the incubator. I've always had the problem with the styro incubators. They do not lose heat thru the Styrofoam, but they lose heat thru the window and it makes it really hard to keep even...
I have to agree with you there. Seems I had breech hatchers sometimes. That's why I like cutting rings out of something, and propping the eggs up. I have also always rotated the eggs from outside to inside so they all get the slight changes in temp.