Try using lower temps, I like 230C in my 3DXL in normal mode and 220C with max intensity and can sesh til no vapor and not get any charring (just sticky goo to q-tip). Max temp plus max intensity will cause char with my homemade rosin and I had to use a mini brass brush or the Pockety wire brush (can't remember now) as gently as possible to get it clean like new again...no scratches are visible from the ordeal.Anyone using pearls all the time in puffco devices without worry of charring?
If I was not in a hurry I may have used a few drops of SimpleGreen left soaking in the atty overnight and q-tipped and repeated until clean as SimpleGreen works well on charred bangers.