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Some fabrics press better than others. Some of the looser knit ploys will flatten under the pressure of the press showing a "window" of your press. Tighter knits aren't as likely to be a problem. Also, you mentioned that your jerseys were a poly blend. If your press is running on the hot side, you could be burning the cotton part of your jersey or melting the poly. You might want to get some samples of different brands of jerseys and see what works best for you.
I can't recommend enough getting a good quality pyrometer and checking the accuracy of your press temperature in several areas of the press temperature. Many pressed, especially the foreign ones aren't very accurate and often have hot spots. Don't try to use one of those infra red non contact heat guns. They won't give you accurate results. Get a real pyrometer for accurate results.
You can get a pyrometer from knight among other places and it's well worth the investment. Once you know the accuracy of your press and if you have hot spots, you can begin the process of adjusting your temperature, pressure, and time.
I can't recommend enough getting a good quality pyrometer and checking the accuracy of your press temperature in several areas of the press temperature. Many pressed, especially the foreign ones aren't very accurate and often have hot spots. Don't try to use one of those infra red non contact heat guns. They won't give you accurate results. Get a real pyrometer for accurate results.
You can get a pyrometer from knight among other places and it's well worth the investment. Once you know the accuracy of your press and if you have hot spots, you can begin the process of adjusting your temperature, pressure, and time.