I found that in glove mode the screen was far too sensitive and if you turned glove mode off then it was not sensitive enough, especially the Back, Home and Menu SoftKeys.
The solution I have found is I enabled Glove mode and then I downloaded SGS ScreenBooster.
In SGS ScreenBooster I set the first three options to minimum, the 4th option (Motion Filter) I set to 39 and last option is set to Max.
That has made the glove mode less sensitive and now the softkeys work as they should.
Hope this helps.