I have been having a heck of a time trying to understand the cause behind flashing for one of my panfish molds (Lurecraft, #5XLU-227). When I stack 5 of the molds together, the end molds are fine but the middle ones always have flashing. I have much greater success when I I only shoot two molds at a time. I'm using the blue hand clamps from Lowes/Menards, and have never experienced flashing before due to clamping issues.
I have experimented with changing pressure, temperature, and preheating mold/injectors, but nothing seems to help. Can anyone explain what might be causing the flashing and/or new ideas to try?