Scraping a reed with only one but GOOD knife does more than scraping it with twelve different ones that are less good.
Simplicity is the hallmark of the right.
If you have finally found a good type of reed, stick to it. Use another number of bocal, if possible. If not, you will pinch the reed to make it sound higher, thereby squeezing off some of the fundamental of the bassoon tone. If the thickness of your gouge is consistent, use a small pair of outside calipers to gauge the height of your reed collar elevation on each reed. Constructing the same model reed and maintaining the same inside collar height will give more consistent tone quality and intonation.