I purchased a set of Sorby's and initially was thrilled with them. After about a week of using them on african mahogany, they are rolling over after a few strokes. I have great stones, 1000, 6000, 13,000 ( Stu's tools) and they get awfully sharp ( my hands will prove it). They just won't hold an edge as I've mentioned above. They came with 20 degree bevels and I decided to change one to 25 degrees thinking that it would help. Nope. I've read some comments about soft steel so I could use some advise. Are Henry Taylor's that much better?