The first video was a product of the suction/warping that happens on running plays when you jam down on the spring button as soon as you get the ball, if you set your blocks up and then run, and then sprint....you don't have that problem.
no suction tackling, and notice how I was able to make a cut and burst into my running lane as opposed to your dead sprint...I mean....you had a blocker out front....no one coming around on the back end....why not let your guy actually block someone in front of you instead of sprinting right pass him? He wasn't even touching anyone and you're sprinting...
And your second video is clearly a bad animation (which this game is full of and it's been out since mid August....surely you're not just discovering this now.)