the first blade- the rough cut blade has a curved leading edge- but after the curve it is straight, and the second- final cut blade is also straight.- i am going to drop in a pm i sent to stringstretcher here.
"the single most important thing, is super sharp blades- that eliminates tearout.
then when i was using the "V" blocks as leadout supports( as per manufacturers suggestion!!)- the dowell would just flip up and tear like crazy and break- so i went to the "holey" blocks- vast improvement.
and both blades each need to take a little of the material off- kinda needs to be split- about 70% with the first blade and about 30% with the finish blade.
infeed nice and stable.
if you would like( no offence intended- just not sure were your setup needs input) i can do a run through with photos for sharpening tools. i am a saddle maker- and we need to get the knives so sharp that they can glide through 1/4" of back leather in one pass- so we get a lot of experience with that-
i could even do it as a "buildalong"- if people were keen.
then as high a rpm as your drill will do and i take about 60 secs per dowell- i will time that for you tomorrow."