I keep seeing videos of the ST3042 on YouTube doing plates at 195 degrees for 7 or 8 minutes. It was taking me 15 minutes at the same temperature to do a 10 inch plate. Then the silicone membrane after the 3rd plate. I replaced it with the spare one I got with the machine from Signzworld. I have lowered the temperature to 160 but it is taking over 20 minutes to do a plate now. Can anyone help?