SouthMark45 - Don’t worry. I also have a Niche, and also have the Elizabeth. I actually went to Bella Barista, took my Elizabeth there. Used their 83mm flat burr grinder and there were no stuck pucks. At all. for 2 hours I tried and failed. Went home, same beans, and guess what? Stuck pucks.
So don’t worry. You are not alone and it happens to lots of people, but the Elizabeth seems to be more prone to it. Do try slacking the shower screen a bit - only tighten the screw until the the shower screen (not the dispersion plate) can no longer spin on itself. That improves it somehow. Also, when you remove the PF, rotate it all the way and twist it a bit, and then pull it out in an effort to dislodge the puck and remove the vacuum which is keeping the puck stuck.
And I agree with @JahLaza - I actually tested 5 or 6 IMS baskets and NONE gave a stuck puck. I don’t know why, but I proved that. I even wrote to Bella Barista about that.