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For those mathematically-challenged,
7.5% translates approximately to a pitch of 29/32" (0.9") over 12", or 4.3°.
A 1:12 pitch would be 8.3%, or 4.8°.
The previously-mentioned 1/2:12 would be...

Well as I said above I wrote to AEA a few days ago. Here is the reply I got back:

Just sent a message to AEA to see what they say.

It seems to me that the rules would be different for a full raked stage vs. a ramp between flat levels. But I don't see that in any of the rule...