Terry,
I have the same problem with DT gouges. I have both the 5/8 and 1/2 inch and have ground 1/3 of it away trying to get it to cut as well as my mastercuts or BB gouges.Last week I gave up on them and they lost their spot in my tool rack!
I have a tormek and a delta vs grinder with wolverine fixtures. I assumed I was doing something wrong also, but I 've run into other turners at my club that have the same issue.
Tom