Ok so I read a guide about dropping items faster using mousekeys. I seem to have almost got it, I start the top left item and do Ctrl 5,2,5 and that drops the item and then I repeat the process. However the distance the cursor goes down when I do ctrl+2 means that the first three items work ok but the fourth one down doesn't because the cursor is in between the two items. I can't adjust the top speed slider because if I go one higher or one lower then it doesn't go down to the second option "drop" from a right click. I don't get how to sort it out because guides don't seem to discuss this as a possible problem.

Use your mouse a little and move it like a few pixels up every time you do it. That's how I do it.

Take the precision mouse off. I'm not sure exactly what it's called but in the wiki article about mousekeys it explains it.

 

I had the same problem you did and it fixed it for me.