Another common theme here is the entry heigh for the Manoeuvre. The report touches on this, but does not give it the "importance" that some here tend to attribute to it. We discussed this a few months ago, but let me reiterate.
AH was cleared to 100 feet for flypasts, etc. It is perfectly legal to enter an earobatic manoeuvre from that altitude as long as the manoeuvre itself isn't performed at that altitude. It is also legal to let down to that altitude at the nd of the manoeuvre once the (e.g.) 500 foot base height has been assured.
The entry height in this case is, therefore, not relevant. For further explanation please refer to our earlier discussion on this forum.