Android build changes Spritesheet Pivots?

I'm working on an app for Android using Unity Free and I am using 3 total Sprite Sheets for my Sprite animations, I was using single separate images before but that's obviously not the best choice for several animations with more than 40 frames each, so I used TexturePacker to create my Sprite sheets and they came out wonderful.

Running the animations in Play mode on Unity shows everything great and smooth, with every animation right as it should be, but when I build and run on my Android device the animations that are using the spritesheets are "shaking", it's as if the pivots on each individual Sprite Frame are off by no more than a milimeter on each frame but that makes it very noticeable on the parts of the character that aren't moving, for example:

• A character that is waving one hand will perform the waving but the rest of the body will be slightly shifting its position on every frame by no more than 1 milimeter but towards diferent directions every frame.

Every animation that uses the spritesheets has this "shivering" effect and I can't find any quality or compression option that would have this effect upon building for android, and that's when this problem happens since it always runs properly on Unity!

Changing the import settings on the spritesheets doesn't change anything either, the problem persists on both compressed and truecolor modes, I can't find the reason or the answer for this, any clues?