I have 5 signs to make with raster letters. The signs are entirely carved with the standard 1/16" ballnose bit. The carves are a little over 3 1/2 hours each on best setting. Have any of you used a 3/16" Ballnose tip and if so did it carve considerably faster? Was the quality acceptable? I changed the setting on "Board Settings" to 3/16 ballnose and uploaded the project (the machine doesn't know that I don't own a 3/16th yet!) but it doesn't appear to save any time at all. How can that be?