I can only slide my upper steering shaft in about 1 3/4" by pushing it in. It takes a little wrestling to get it back out. I am not comfortable tapping it in with a mallet for fear of not being able to get it back out. This is with no belvelle washers in place and a little anti seize on the mating surfaces.
This is the Factory Five Steering shaft assemble from for the Mk4.
How tight is too tight?