I'm sorry I didn't do the digging to figure it out for you. It appears it is raising the share difficulty that saves your efficiency. I just figured you were the expert and could figure it out easier. Sorry for wasting your time. I clearly keyed in on an incorrect statement, which caused you to dismiss everything I had to say.
Sorry if I look a bit harsh, but I don't spend much time on bitcointalk right now: I have a lot of work currently and I'm slowly recovering from a broken back at the same time so if I even suspect I won't find useful information I don't dig to save time.
The meds I take may not help either: they are known to have several side effects on the mood and short-temper is one (I may be predisposed for this one...).
Raising share difficulty may not be the solution: as I wrote in the previous post the published results match a configuration with standard share difficulty.