I have had one for several years. I find this myself. The bit is sharp, but does not cut well for the first two or three attempts. I assume, that until I get the relief angle a bit "relieved", it rubs a bit. After that, it cuts better than I can do myself, at least for the smaller stuff. I like the thing, I use it regularly, but I recognize I can make a "sharper" bit. NOT a more even, or long lasting, bit. Just a "sharper" one.
Look at the drill at intervals while grinding it. Leaving it in the holder, pull it out and look at the drill carefully, under good light, with corrective lenses if necessary. The chisel point should typically be at about 45-50 degrees to the cutting edges, depending on what you are going to use it for. Larger angle, gives less back relief, better for harder materials and shallower feed rate. Smaller angle, more back relief, better for softer materials and deeper feed rate. Also look at the side of the drill, at the angle of the back relief is visible where cutting edges meets the side of the drill. Less angle gives slower cut, more angle gives a more aggressive cut, but less strength. Look at the sharpening tool manual and at the link in post #7. Get a drill point gage so you can check for equal length cutting edges and equal and desired angles of cutting edges to shank.
