Large amount of time in humidity chamber

[KMG]

That care sheet is likely outdated and obsolete like many of the care sheets floating around the world wide interwebs.

Time has shown hot spots of 88-89 are plenty warm for BPs. Nothing in any of my enclosures hits 90

You can see how the OP could be providing such numbers though. Maybe the care sheet is outdated but the OP is not wrong following it.If it needs to be updated it must not be very important since it's been like that for years without anybody doing so.

All that said OP I would reduce it to 88-90. That gives you a cushion for temperature fluctuations.