@Dojima
if you buy a thicker thermal paste it will help secure its location (as it hardens a little bit as it dries, more like mud than a traditional adhesive). the fact that it seats so loosely is why i recommend thermal paste. it will help with both keeping the thermister in place, as well as improve the thermal conductivity for less temperature fluctuations. i recomend Artic Silver brand (available on amazon) but really any anti-oxidant compound that states “improved conductivity” will work. i used a brand called “ox-gard” (also available on amazon) that i got as a big tube from my local hardware store. but that is much harder to apply to the tiny hole then the nice syringes.