If you have the pop off outside of the transom without modifying the transom it is my opinion that you are way to far back.That boat has no proplems getting loose. Whatever gets has to come down and that is where this boat has a problem without the add on sponsons.
What degree should I reset my intake? It is a 4 degree berkley and is set back with the p/o valve outside the transom. This was Nelson 109,s boat. Does anybody know the previos history on the boat?
There isnt any magic to the angle its installed at. Id be installing it at 4.25-4.5 degrees in relation to the bottom of the boat. I also wouldnt hesitste to set it way back like you mentioned. I do think engine placement is critical though. Just my opinion anyways.
I raced with Nelson and helped him on the hardware on that boat. It was always a good boat.