Thanks for the comments both!
I agree - I love the hunt of research and the thrill of tracking something down, the more obscure the better. I also agree that what I'm after may not exist. That's the problem. How many days, weeks, years do we go over the same ground, double checking, hoping new records are now available and pushing a little bit more in a different direction because that might provide the golden nugget? When do we say 'enough, it doesn't exist' and draw the line? That means no more progress into the past. The family tree can't be pushed any further from this point? I will always wonder if I'd failed or had actually done enough. These are my prime branches, they mean a lot and DNA isn't helping so there's another doubt hovering. Drives you mad, doesn't it