The base started off at 1, but I had it professionally tuned at a ski shop and asked told them to put a 0.5 on it. I was a little disappointed with the results of the professional tune. So shortly thereafter, it was easy to make the decision to tune it myself. The base at that point was not 0.5; it had either worn very quickly or it had been tuned to a greater angle. If you want something done right do it yourself. Now if I could only find a $50 base grinding machine.
I don't mind the high base so much; they are SL skis, so they don't spend a lot of time flat.
If you are taking base material off when you apply base edge bevel something is wrong. Or do you just mean the base is higher than the edge, which is true of ALL base edge bevels.
And you can definitely get more base bevel than the bevel angle guide is calibrated at as Zenny says. Just keep on filing or stoning.
The reason this guys skis were sharper than yours was not because of the base edge. More likely something in your side edge sharpening process. I would guess like most home tuners you over beveled you base edge.