Sam,
We’ve got that same Danuser post hole digger. I spent a lot of time standing on top of it as the auger bounced through football sized stones in gravelly ground.
After buying a Danuser bucket mounted auger, I won't go back to a 3pt. You can add all the downforce you can wish for and when you hit a big rock, just lift up on the bucket, reverse the direction, and back right out. You can also drill hole at a 45 degree angle for setting heavy brace posts.
Ed
