The way to tame a default is you basically do whatever you want up until it's at 90% domestication. Then you train it the opposite of the method you first used to cancel the tendency. If it's semi-pudgy or semi-ornery then you just ride a while until the tendency goes away. If it's semi-rider then you just attack a wall or a lureplant or something until the tendency is countered. The shifts between tendencies always goes through default first, so you have to nail that exact moment before the domestication. Also yeah you kind of need a domestication info mod to see the %.
If no mod, you just have to constantly bring it down back to default and pray.
also for the record I haven't really played DST since the YOTB, I hear there's many new bugs with domestication now. It's probably a mess.