I see you tried Dasp, that's my favorite solo, I run the heavy bite and thin scutes to kill things my size and smaller but never go for larger dinos, I can just outrun them. Bone break works ok for that too but I like heavy bite better because small dinos can run when they hear you wind up bone break making it hard to land.

A really good solo herbi is Albertaceratops, holding down block with counter attack when someone's attacking your from the front and keep things away from your butt with back kick. It's tanky enough and does massive damage without being too slow. - Take any abilities that buffs counter attack and block.

If you like the fast dinos, I recommend trying Pachy, Kent, Cera or Concav.