I have had clutches all over the board in gender ratios when incubated at the same temps (80-82 degrees). I've had everything from all male to all female clutches at those temps, but on average I get a 1:1 ratio.
One year I had eggs incubate at much cooler temps (in the 70s). They took forever to hatch, as would be expected, and the genders were pretty even at those temps as well.
I don't incubate higher than 82 degrees if I can help it (although there are temp spikes up to 85 for brief periods). I feel that kinking and poor-doing hatchlings are much more prevalent at higher temps, so I can't help much on if TDSD (temperature dependant sex determination) occurs at higher temps. Obviously at higher temps, the eggs hatch much sooner, on average, but I haven't heard of anyone getting much of a difference in sex ratios.