The design is simple. The bottom pad is not level. The top heating pad is not level. Between the two the pressure on the plates is not even. The main post moves backwards as you clamp the plates together. This makes the pressure area more uneven. The solution is either/and/or turn the print around 180 degrees to try to get even pressure, Add spacers at the top of the mounting plate arm to get the top plate level, Stiffen the mounting pole. Leveling the bottom pad is not easily done. I have done the first three fixes but even after this the plates do not stay parallel. Customer support suggested less pressure, but with the plates not parallel to start with, you will have no hope of a good outcome.. I suggest finding a press with better supported plates. I will continue looking for a fix so one day it might be fit for purpose.