With identical components there is only a handful of conclusions. Either something isn’t tightened properly, I.E. torqued. Something is broke or most likely the struts/shocks are bad. The last one is the most likely. Folks act as those struts last a long time! They don’t! Which is why they are stupid, but we’re stuck with them. They are nothing but a shock with a spring wrapped around it. 25,000 miles always was the benchmark for replacing shocks. It hasn’t changed. That applies to struts as well.
Valving plays the biggest roll in shock/strut performance & you can’t really evaluate that by pushing down on a cars static position. Plus progressive springs actually make it harder to evaluate shocks/struts due to how they work. I have see struts come off a car that appeared fine in performance, but when the springs were removed & then compared to new struts it was obvious how bad the deterioration was. Just my two cents worth.