Aquadrive installation

[RDW]

I have had a refit with a new Yanmar 57 horsepower engine and a new B-10 aquadrive. We went to Tortola with the Caribbean 1500. We later went to St. Martin. On the way we got a line around the prop. When we realized that we had a problem we stopped using the engine and sailed on. We used the engine for the last bit to get into the marina.
Upon inspecting everything we found grease had been released from the Aquadrive boot. Now we have various parties pointing fingers as to whether it was a proper installation. One party says the offset (out of alignment) should be greater than 12 degrees and the other says much less.
I will try to post pictures.
I would enjoy any advice.