Replaced bad tie rod end and ball joint Les Schwab aligned auto started shimmying, why

What is your question?

I had a front end shimmy, replaced a bad ball joint and tie rod end. I then took the car to les Schwab for an alignment. They did the alignment and said that the alignment went well and the joints were good. With only about 50 miles on the alignment, the front end is shimmying again. What’s my next step?

What makes this problem better or worse?

At about 30/35 mph the shimmy is no longer shaking the steering wheel

How long has your 1994 Mercury Villager had this problem?

About 10 miles