First, take a deep breath. These snakes have been hatching for ions without our help. I would suggest you not candle anymore because when they move around in the egg they are shying from the light. While I have no proof of this, I believe it could result in a baby tangling itself in its umbilicus.

You say you are incubating at 88.5 but what are you measuring the temps with to corroborate that? Are you just going from the thermostat or have you been verifying with a temp gun? If it is truly is 88.5 then things should happen soon. Just watch for little cuts to appear in the shell or a head poking out suddenly without warning. I never cut unless one doesn't pip for 24 hours after all the others have. Best of luck and I look forward to pics of the babies.