[Por_sha911]

I would start shopping around for another job. Sounds like they are content to give you unrealistic goals and then penalize you for it. Its a scam but in these times employers know they can get away with it if you don't have other options. Not a great way for a company to treat people they value (or plan on keeping for the long term).
As far as how to ask goes: always negotiate from a position of strength. Build a case and print it out. Show facts and figures that are favorable. If it isn't going to happen this time then, every time you are asked to do extra or you get a compliment remind them that you expect this to be reflected with your next review and make a log.