About two weeks ago, I put a coil build on my TFV8 RBA-24g Kanthal, 7 wrap, 3 mm ID, .41 ohm (on both my ohm reader and the mod). About four days ago, it started reading .31 ohm on the mod, so I took the tank off, put it back on, number still read .31 ohm. So today I put it on the ohm reader...