All of my atty's stay at the same resistance when I use them but my kayfun lite+ changes. Not noticeable, only on the 2nd decimal place. I have tightened the 510 pin completely, my screws are as tight as can be and my wire is perfect. It was only happening on the rdna at first now it is the same on my 150tc. It slips back and forth between 1.26 and 1.30. But no other atty is the same. any ideas?