It might be interesting to talk to them. I have only a little exposure to the Amish and Mennonites. Their world fascinates me.

Yes, headwinds make a huge difference in speed as well as effort. I've been recording my rides for a few years, and I recommend you do, too. I have a couple of rides that are so much faster than normal, and I didn't make notes of the winds on those days. I can't find anything else to explain the speeds.

Here is my ridewithgps profile. Feel free to connect with me there.

And check out this wind map. I try to remember to check it in the morning.