175 lbs X .125 = 22 mgs (roughly)
You are at 40mgs which will more than make up for any quality disparity (notice I say "more than"). I think you need to understand that anavar is not a quick mass builder but a slow steady builder of quality gains. One does not explode overnight with it. Expectations are the key and you might be expecting a bit much.
I don't know if going to 50 or 60 is going to produce a dramatic change for you. That being said, var is pretty safe relatively so if you were going to go up this would be the drug. Still, I think your expectations might be skewed.