I hear ya. I initially found mine needed roughly +10. After playing with it more yesterday, got it narrowed down to +8 at close distances (MFD to about 30 feet). Problem is, shooting a mountain at near infinity, it was sharpest at +5. Not sure what I'm gonna do at this point.
That is what was happening with mine, but a bit more severe.... MFD to normal distances, perfect at +9... Anywhere near infinity, needed -2 to 0.