I was taking a long time to get through a straight razor shave at first, didn't seem to matter how I prepared the lather because it was going to dry up by the time I got to the right side of my face. I could re-wet it a little but that would make it runny.
I just quit lathering my whole face and started lathering 1/2 at a time. Problem solved! It wasn't long before this wasn't an issue but it sure helped while it was.