How are you measuring temps?. Also ypu shouldnt atte.pt to feed and absolutely no hamdling for atleast a week i wouldnt handle for atleast 3 sucessful meals. Temp at the glass should be 90f for proper digestion and ambient should be around 80. I use a infrared heat thermometor they work great for checking surface temps.
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Nevermind just seen the comment u use heat gun sorry. Anyways the glass should be 90 so of its reading 90 its at a perfect temp i would just keep an eye on it and adjust as needed. I check mije every couple days when i can.