75 mph winds, not so much... Surge - N.O. experienced a 30' surge during Katrina. Almost three times your highest prediction of 11' at high tide.
NOLA did not experience a 30' storm surge. The max surge was 27' on the MS coast. Max surge in and around NOLA was 12-16'. Surge was 12' at Lakefront.
But...its apples and oranges. You can't compare surges from one place to another as if they are all the same. A 14' surge over Miami would do MASSIVE amounts more damage than say a 30' surge along the MS/AL coasts...or in Chambers County TX.
A 12' surge at Kings Pt and 11' at Battery Park will cause a LOT of damage...much more than 12' in MS.