Blurriness on skinned sprites (Animation 2D Package)

So my problem is very simple to explain but I'm trying to get to the source of it. I have a skinned sprite (e.g. a tongue) which I added an IK Manager to. BUT when I try to move it around parts of the sprite tend to get blurry, even if the bones are in very normal (not-acute) angles.

What I have tried so far:
- Change the auto geometry parameters. Very low values give a blocky animation and blurriness, high values break the sprite at the edges, making it discontinued (third pic). Low to mid values tend to give the best result, but still gets blurry with movement (second pic).
- Messing around with the weights in the weight brush.

Pics of the skinning of my tongue, of the blurriness, and of the breaking high values cause are attached. If you have any thoughts please share, any feedback is super appreciated!