Yep, 88 is good and actually a safer temp than 89 as it allows some wiggle room incase temps increase for some reason. When in doubt, colder temps are better than hot. A colder temperature will mean it'll probably take a little bit longer for them to hatch (probably a couple days difference). Also, is your probe just in the incubator, or in the actual egg box? If it's not in the egg box, the egg box will be a different temperature than the rest of the incubator. From what I've seen, the probe sitting outside of the egg box results in a lower temp egg box which results in clutches taking longer to hatch (up to 70+ days depending on the temp).
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