When curing shirts, you want less pressing pressure for the moisture to be released. If you trap the moisture, then you don’t get as good of a cure. Another thing to try if your ink requires longer times like two or three minutes, for better curing, cut your time in half and press twice. Stop pressing after the first one or so minutes, to let the trapped moisture escape. Then, continue to press for the remaining time. This method will result in a better cure.