FX2s/FC630 iDRAC 2.70.70.70 fan speed behavior

I have a FX2s chassis that currently has three FC630 blades installed. All are running current firmware except for the iDRAC until yesterday. I upgraded the iDRACs in all servers to 2.70.70.70, and a while later, I noticed that the chassis was noisier than usual. When I looked at the CMC, I found that all fans were at 50%, which didn't seem right.

I reverted all iDRACs to 2.63.60.61 and after everything re-initialized and the CMC brought the fan speeds down, they settled in at 20% and stayed that way.

I re-upgraded the iDRACs again this morning to confirm the behavior and saw the same exact thing. After the upgrade to 2.70, chassis fans at 50%. After reverting to 2.63, they settled in at 20%.

Any ideas why 2.70 is causing the chassis fans to run at 50% when they don't need to be running that high?