If you look, there is two holes in the base where the ceramic fits. You want the shortest post(neg) screwed into the right hole when looking down from the top. Trust me, their is a huge difference. Might want to look into this before taking sandpaper to the atty.
Looking at the pic below you will notice there are 2 threaded holes in the cup/base portion of the RM2. You need to put the ceramic piece into the cup and move it till the ceramic holes line up with the 2 holes in the cup. While doing this make sure your posts are at a proper position for the coil to end up at your caps air hole at final assembly.
after thoroughly cleaning it all out (make sure your drains are plugged up unless you like loosing stuff down it) you will need to ensure the posts/holes are lined up properly. Prior to disassembly w/ the cap on I took a cobalt bit and scratched a marker into the brass on the bass of the RM2 which is not visible when threaded on for a point of reference. This is my air hole mark. If you don't do this you could reassemble it and have your air hole on the opposite side of the coil.
I'd also check for a hot leg mousie. They are an often overlooked cause for a hot / harsh vape. I have a VERY difficult time eliminating hot legs on coils with less than 8 wraps
That and fixing the coil / air relationship as others have mentioned and it should be game on
