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There are certain channels in the 5Ghz range that require the access point to do checking to make sure they don't actively interfere with radar...

See here for a document from Cisco describing the issue:

http://www.cisco.com/c/en/us/td/docs/routers/access/3200/sof...

interestingly enough, hard setting the channel to 100 might violate FCC regulations, and DFS should still be used...

There isn't radar within 100 miles of me so I'm not too concerned. Regardless, this AP firmware won't let you hard set to channels the FCC requires DFS on.

Channel 100 requires DFS... so you did set it to a channel that requires DFS.

Can you please find the list? I think there are just 13 channels (or 11 depends where you are) 2.4Ghz

Still can't find it. I haven't had issues on 2.4ghz, this is on 5ghz. This thread seems to cover about the same thing I discovered:

https://www.reddit.com/r/apple/comments/2zo1uo/if_you_have_s...

I'll have to give that a go. My MBP performs poorly on dual-channel WiFi