Well, you are setting plane position to touch position, of course it immediately teleports there. If you want to move it slowly, the easiest option is to use MoveTo behavior. You can configure its speed and acceleration/deceleration.
Also, I don't understand why you are comparing touch speed. It's only useful for swipes.
So all you need is a simple event like this:
Is in touch -> Plane MoveTo Touch.x, Touch.y