I feel kind of the same way. I've been using a Logitech MX518 for about 5 years, and while I love it, I have looking around to see if there's anything I might like more. My grip is sort of part palm, mostly claw, and the MX 518 is the most comfortable mouse I have tried out (for me). I've been especially interested in the Roccat Kone +, as it is supposed to work for both kinds of grip, and I've read people online with both grips say that the mouse is very comfortable. I don't know how much DPI I need in a mouse, because I move the mouse with small movements, never moving my wrist, and "flicking" the mouse when I need to move the cursor quickly or long distances (I guess this is "high-sense"?).
I also need a large mouse for my hand to be really comfortable; again, I love the feel of the MX518. This has made me not want to get the RAT 7 or Logitech GX9. My only concern about the Roccat Kone + is that I use the scroll wheel a lot and Roccat seems to have had QC issues with scrollwheels in the past.
Maybe I should just stick with the MX518? It has been awesome and has held up nicely to much abuse in the last 5 years. To the OP, if you are anything like me, then you would love the MX518; also, you can find one for cheap, so not much loss if you find out that you don't like it.