sounds like from your post you did some research on this. one breeder I know incubated slightly lower than you and his eggs pip around 70 days. I saw the hatchlings a few days after that and they all looked very healthy and everyone couldn't believe how big they were.
another breeder I know did lower temps on his caramel albino clutch. he was getting kinking and when he lowered the temps, he still had kinking, but a huge improvement. he even stated that maybe he needed to lower them even more. this was only 2 clutches that I know of with results. these results could of happen even at higher temps. more studies need to be done to determine if lower temps will give better results. but what I've seen, I think it's well worth the research. good luck on your clutch and I'm also waiting to hear how it went for you! don