I bought the Lee PPM after using a friends
I've been hearing the same thing. I'm about ready to buy a ppm to see if it will run Unique.
I also have a Hornady and Uni-flow. I could never get stick powder to run through my Uni-flow either. Didn't bother to try it on my Hornady.
Wish I had better news for you.
My PPM didn't work well with Unique. I use the lee auto disc now, that is much better.