Done this medium. That expert had 25 in the middle , so only 2 solutions left. I tracked one almost to the end without seeing a contradiction. So that became my guess, and it was the wrong one.

Yes, I kept seeing 2 x-wings. But could not get either to resolve without finding a contradiction. Will try later by printing it out and solving on paper. Sometimes I do better with it on paper than on the screen.

Last 2 mediums were easy. Took another shot at November 10 expert, now agree with MrOoijer that it resolves to a single choke point, a 25 pair with no obvious way to avoid testing either or.