50/50 shirts still have moisture in them. Just as much as 100%. Press that shirt until its bone dry, and see if you get a different result.
If there is water trapped under the transfer, when you press the transfer onto the shirt, steam from the shirt will rise of into the transfer, causing the the transfer not to stick to the shirt properly. That is why you have to get all of the moisture out of the shirt.
I have never used bestblanks paper, so I cant reccomend a temp or time.
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