Character sinks to waist level?

Tried to get some locomotion animations incooperated into some custom made animations, however there seems to be severe jiggle of the upper body because of the root motion. Trying to turn this off by disabling the floor on the avatar mask just makes the guy sink into the ground. I've tried baking the animations positions but nothing really helped, here's a video I took:

Tried a bunch of different things but nothing really worked.