I did not fire my jewelry cabs hot enough to round the edges nicely. I want to refire them to a hotter temp, but I am afraid of devit. I know that there is a recipe to help prevent this, however, I can’t find where I saw this. Can someone help. Also, I used a 3mm dicroic on the bottom and capped it with 2mm clear. Should I be capping with 3mm, same as the bottom piece? Thanks in advance. Kathy