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In my experience incubating at or slightly bellow 80 is almost 100% effective in giving you all females. If you have spikes or if you up the temp to the low 80's a few males will sneak through. I have incubated at 90 to produce males and have had about 75 % turn out to be male. I use a hovabator so there are lots of fluctuations so this could be why my perecentage of males isn't higher.
A couple of years ago I tried the a modified version of the tremper method and left the temps 80 for females for the first two to three weeks to set the sex then gradulally upped the temp to the upper 80s with a max of 90 to improve color. Color didn't improve. I didn't use that method this year and the babies came out the same. What I did get doing this, was a bunch of males.
-Alice
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