When you are making a full splice 4 point cue is having uneven points a common result?
Yes, it's very common.
It's also not that difficult to avoid.
Some care and planning, and decent equipment will yield excellent results.
As finish can flow just like old glass windows do.
I think they have changed the physics books by now as most have wised up to the fact that glass does not flow.
http://www.glassnotes.com/WindowPanes.html