Hi Steven:
I agree with Karl 100%
The problem is not the blade - the damage is done even before you start scrolling
Take care of your method of drilling and your problem is 95% solved
If you still have tear outs with a clean drill hole then add a sacrificial piece as your bottom layer as mentioned above NOTE:
Then and only then, if you still get tear outs, after doing all of the above,
Get a new hobby, because this isn't for you.......just kidding!!! honest
You'll be alright,
Please let us know how these suggestions worked for you
Fab4