Well, if the tiles feel really hot when you put your hand on them, then your temps sound off. The tiles should actually only warm up nicely if the temps are correct. Are you using a temperature gun or digital thermometer with long wire & probe end? If not, those are the only 2 ways to get accurate readings and any type of stick-on thermometer can be off by as much as 20 degrees. Let us know what type of thermometer you are using and we can help further.