What is your coil inner diameter or what size of drillbit or screw driver u use to make the coils? It is impossible to jump from 10 wraps at 2ohm to 8 wraps at 0.48ohm, unless there is a sort somewhere or your coil connection is loose.
I'm using those metal ear diggers as my coil ID. before I tighten the coils on the 8 wraps, they came in at 1.2ohms. And then... :/