John:

I have a thought about this situation.

Some of these planes had the elevators built with a twist in them. Most of the time it was just in one elevator, so that if you had the counterbalances lined up with the h-stab one of them was off from the other one. Check yours for this.

Look at it from the rear with both counterbalances lined up with the stabs, it will be obvious of one of them is off.

If this is the situation contact me and I'll send you another set (if I have the right color in stock).

TF