Hello @Yoerika83 
Here are the recommended settings, have you tried the following setting:
- Stainless Steel Tumbler:
Temperature: 370 ± 10°F
Time: 130 ± 20 seconds - Ceramic Tumbler:
Temperature: 385 ± 10°F
Time: 400 ± 20 seconds - Glass Tumbler:
Temperature: 370 ± 10°F
Time: 300 ± 30 seconds