Another thing to verify is that your XY resolution (controlled by the distance from projector to vat) is set correctly.
For the Tiny Tank, that would be 37 micron XY resolution.
The easiest way to do that is to use @jensa‘s calibration grid (available on the Downloads page) printed on a laser printer and then cut down to the 37 micron size.
http://www.kudo3d.com/forums/topic/calibration-grid-usage-video/