Professional Shop? did they install the springs in the upper pockets squarely, did they accidentally double up the isolator rubbers, are the bottoms in the pocket squarely, did they over torque the control arm bolts, did they replace the shocks with high pressure gas at the same time. There are a lot of factors that a guy working for an a$$hole, having a bad time at home or any of a million reasons might overlook and have someone who isn't aware of all these things might assume parts are the issue. Conversely, UMI does reccomend that you cut coils to get desired stance if its not exactly to your expectations. You think you have a heavy front end, maybe its not? Did you order big block springs by accident? an SBC with 2 batteries isn't as heavy as you might think.That's a great question; would a professional shop make a mistake like that?
There are a LOT of factors in the ride height equation.