Well....i probably wouldn't feel anything off 10 either, but i figured you had a lower tolerance than me. I was wrong, i only use poppy seed tea most of the time, i got some percs and 30 mg actually had me really high, so my tolerance is still pretty damn low. Next time take 20 if you didn't feel anything from 10. I take 30: 20 off the bat, then once i feel it kicking in a lot (around an hour or two later usually) i take the other 10.
Sorry i misjudged tolerance on that one, but trust me you CAN get a buzz off it.