Magic Mouse horizontal movement slow

I continue to have trouble with my new Magic Mouse. The ergonomics are terrible - it does not fit my hand at all like my other wireless mouse and now the horizontal movement is about 1/10th of the vertical movement. I have cleaned the bottom and left it on the Mobee Charger overnight to be sure it has a full charge but the movement problem persists. I don't know if I can still return these items but I will surely quit using them! The indent on my little finger, it controls the mouse from the right side, is turning into a callous due to the sharp edge on the top of the MM. I also purchased the MM Fix and that didn't help either as my hand was too large to even make contact with it. I sure can't recommend these products even though I enjoyed the new features on the MM while they worked.