Reverend, don't give up. Maybe the sky transparency was very poor. Malcolm touched on this subject a bit. This is a big killer on comets. The last couple of times I haven't been able to see it either in my 10x40 binos and I know exactly where it is.
It's very hard to notice high cloud at night time.
David, I'm glad to hear you're still getting good use out of that eyepiece.