74 Duster front end too stiff

I took my car to Good year to have the front suspension redone, to my surprise shortly after i dropped it off they called me back to tell me all of the front suspension has all been replaced except for the upper control arm bushings.
So I had them replace those as well as install a set of Bilstein RCD shocks.
Here’s my dilemma when I go over a bump or a divot in the road it feels like there’s no suspension in the front end, if it’s a speed bump that is gradual the suspension works however the divots are like BAM horrible sounding and feeling, what is causing the front end too be so stiff and what Can I do to fix it please.
I have 225-60r 15 cooper radials up front