Bilstein 6112 thump?

Ever since I installed my 6112 coilovers I’ve noticed on small, jarring bumps that I can feel a thumping in my steering wheel/floorboards. It only happens occasionally and doesn’t seem to do it when I’m on gravel/two track roads. I’ve shook everything I can think of and bounced the front up and down, side to side but can’t get it to make the thump. Stock suspension was smooth. Coilovers came put together with driver side spacer installed. Got them set on max height and pretty sure it’s the 600lb springs. Sway bar is removed. 1.25 Spidertrax wheel spacers. Only thing I can think is something is loose so I plan to check torque soon but curious if anyone has felt this and what they figured out!

 

Did a thorough inspection, made sure torque was all spec and I found some play in this area of the steering column. Just below the U-joint where it goes into the power steering pump I assume. Picture shows where the slop is, screwdriver end is pointing at it. Tried tightening that bolt but it’s rock solid. Any ideas?