Animating Pegs Harmony 10

I’ve created some bubbles to translate through a shot I’ve animated. They’re grouped under a peg. What I want to do it have the bubbles move through the frame in an S curve and animate independently from one another.

For the first issue, how do I edit the X velocity to soften the change of direction leaving the Y value linear? The set motion keyframe button doesn’t seem to allow for it, so maybe I am approaching this the wrong way.

For the second, I’d like to not only have the bubbles move at different rates from each other, but deform slightly. Bubbles were created using the eclipse tool. Suggestions?

And OT, but what is the main difference between Animating mode and Hand Drawn Animation mode?

Thanks.