IMO that schedule is a bit aggressive. Start at 1/2 hr. Then increase by 1/2 hr. Then leave them in for a day, then 1.5 hr. etc. You have plenty of time so erring on the side of caution is better. OTOH, they would probably do okay on your suggested schedule.
Temps sound okay.
The unmentioned unknown is wind. Have you been using a fan?
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