Drag and drop drag animation bugs

[BirdInTheCity]

Bug, feature request, or proposal:

Bug

What is the current behavior?

Two visible issues in the clip above:

1. Two cdkDrag elements overlap (Theatre and Transport) during drag. The larger Transport element offsets itself by its own height rather than the drag element height.
2. Drag element "jitters" during rollover of the larger Transport element.

What are the steps to reproduce?

Pick up the right element and rollover the elements in the left panel.

Attempted to provide the sample cards on Stackblitz.

The drag-and-drop is responding oddly though. I'm unsure why that is.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Latest release (6.4.5)

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