Yep, I agree that incubation temp has nothing to do with sex determination . . . however, there's some speculation that certain females tend to throw more females while others throw more males. Check your records again and see if a particular female tends to have more female offspring--it would be interesting to find out if this was true. It seems to be true with mine:

Female #1
7 egg clutch (5 hatched): 5 females
9 egg clutch (9 hatched): 7 females, 2 males

Female #2
7 egg clutch (5 hatched): 1 female, 4 males
7 egg clutch (7 hatched): 3 females, 4 males

However, I do believe that incubation temps can alter pattern and/or color. My first clutch of babies was incubated slightly higher than average (my thermometer sucked back then--I have since replaced it with a more accurate one). The thermometer I used back then said 90 degrees Fahrenheit, but it was +/- 2 degrees. I believe they were actually at 91 or 92, the higher end rather than the lower end, since they began hatching at day 49. Many of the babies from that clutch hatched out with very busy patterns and brighter-than-usual yellow color. The one I held back from that clutch has since darkened a bit, but still seems to have a lighter appearance. As babies, though, one in particular resembled a classic jungle (black and bright yellow--I wonder if the incubation temp is what makes classic jungles . . . could be a hot spot in the incubator for some clutches?).

Interesting theories for sure, though!