I've been tinkering with the sawblade knifes for a little while now and have found that the lighter cut-off wheels work best. I tend to go through a lot of them though. The main thing to remember is not to let the blade get too hot to touch while cutting.
I use a belt sander to bevel the blade, but a good grinder will work too. Again, make short passes and don't let the blade heat up. Keep the angle around 22 degrees. I do the final edge with a stone.
Look out Adam, this stuff is addicting!!!
-Brett
P.S. Post pics when you're done.