Your calculations are way off.
Even if you're only getting 300Mhash (undervolting?) you'd be earning BTC5.3 per month or so at the current difficulty. On a decent PPS+ scheme like projectx, Clipse's pool or GPUMAX, you'd get >6.
Yeah, it's late (early) and I'm tired, lol. I was doing a 10-day average on what I've seen so far, forgot to multiply by 3.
I'll have to check out those other pools. Thanks for the heads up, and for the math, lol. My brain isn't working at this hour (4am) I guess.