I agree, it would be good to know the outcome. Mistakes are part of the process. Correcting them makes everyone safer and makes a better product.
Compare the Zodiac extension bracket on the 733 or the builtin on the 920, no comparison in design and function, the Armstrong design may have...
You have 3 issues. Your extension is a bad design for that size boat. It should not go up, but follow the hull flow, and wider would help as well...