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Still pretty small. Can you run dry for a few days? Or mostly dry? Try for 25-30% until lockdown.
ON SECOND THOUGHT
Are you 100% sure on the dates? And temperature? Because the chicks in there don't look like day 17.
I'm guessing your thermometer is off, and temp is too low. Which means it's not actually an air cell problem.
By day 17 incubation with correct temps there shouldn't be that much visible in the top of the egg/under the air cell. the dark mass that is the chick should be taking up that space and making the vascular system non-visible.