I'm going to buy a Lenox Diemaster 2 blade and need some size guidance. The bowl blanks that I process are in the range of 6"-16" in diameter. Which would be better, 3/8" or 1/2"? How about blade thickness - .025" or .035". Finally, I see that that the lowest number of teeth is 4tpi. Is 4tpi too many? Should I be looking for a different type of blade in order to get 3tpi? Thanks.