I am sorry, but that is exactly why i ( for the first time, even after PES 2014 bugs and with input lag ) left PES.
Dont take it badly, i am not ignoring your playing skills, its just my personal opinion.
The last time i played, i posted here an image of winning 10-4 with FCPorto on an ML game with top pLayer. I never had scored 10 goals before on top player. I was completly disgusted.
You probably can score 10 goals with assisted controls. Try less assisted settings if this is the case.