I'd be listenng to my gut on more than one issue........is the leak fixed? not that the backstay hitting your head is an issue, but it will not go away. Now if you are sitting off to the side most of the time, not an issue.
This does not sound like the boat for you. You seem to have found too many faults with this one. Now the same brand with "ONLY" lets say the back stay issue, no leakage issues. one that is sailing, motor works etc, The only thing you can find wrong is the color of the boot stripes........boot stripes are easy to change out from red to blue or black or pink with purple polka dots!
She drives me boat,
I drives me dinghy!