Do the Blue Angels have a "Hard Deck" (minimum altitude) During public performances?

[Wrongway Feldman]

Do the Blue Angels have a "Hard Deck" (minimum altitude) During public performances?
If they do, does this apply to all the maneuvers they perform?
Or does the "Hard Deck" change depending on the maneuvers they perform?

The reason I ask is, when the Thunderbirds performed in Oshkosh they seemed to be pretty far up in the sky. (Hard to see)
The Thursday practices or site orientation seemed a lot more intense and low flying.
I have good video of a couple Thunderbirds chasing each other on the flight line, very low, fast and loud.
They were buzzing around like fire fly's.

Blue Angels Maneuvers Manual

Blue Angels Support Manual