Don't cut yet. I incubated at similar temps and I got my first pip on day 68. I cut 2 eggs on day 67 one piped on 68 and the other on 69. I cut the remaining eggs on day 69. Wait until the eggs fall apart. Mine were completely apart at day 67. That top one will lift right off the others just before hatch time. Also, mine started getting small spots of clear shell in the creases the day before pipping. You can cut early but it wont make them come out any sooner and every day they are cut there is a bigger chance of mold or bacteria introduction to the sterile egg environment.
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