I did a box of paper 6 pt. crimp first and made no changes to my press, same as I do 2 1/2" Cheddite plastic, same results, very nice clean crimps plastic or paper. My early attempts at roll crimping were "ify" at best (tools from BP and Precision) then I bought the tools from the fellow several here recommended, totally different results. Try
www.thereloadersnetwork.com, you want the 4 pin roll crimp tool. I now have a full set 10,12,16,and 20. I made the "machine" seen above to drive with an 18v drill on the screw driving speed, works like a champ. Couldn't find a small bench top drill press with sufficient torque. I load a tray (25) hulls, no crimp. Then go to the roll crimp rig, card'em all, then do'em all one after another. Having the heat the power tool generates in the roll crimp tool definitely helps in my opinion, certainly in plastic. I use a tiny bit of candle wax about every 10 to 12 rounds to lube the tool, seems to help.