My advice would be, that if you incubated at that temperature, it is quite possible that your eggs might go to the 58-60 day range. I wouls wait until at least day 58 before debating cutting. As for the increase in temperatures, all eggs do that in their last week of incubation. It has to do with the eggs releasing water ( the reason why they dimple in). It sounds ;like you are in the right track to have some pipplings in aout a week.
Congrats,