Hm, my only suggestions for that would be possibly try lowering the temperature a couple of degrees the last few days of incubation, and make sure they get more air than usual.
Apparently brooding females loosen their coils at this time and expose the eggs to the air, and the eggs' temperature drops. So if you have the problem with several clutches, it's worth a try.
Also, do you have any references for the Pearls not surviving? The only note I can find on them is one from NERD stating they've been produced twice from Woma X Woma and that the genetics were still being studied.
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