>>The location of the wreck means nothing, it's already been more or less proven that the Titanic zig-zagged down to the bottom, she didn't just drop like a stone from the very position she was sinking at. The journey to the bottom might well have thrown her off a couple of miles, as well as movement of the lifeboats after the sinking, etc.<<
Actually, the location of the wreck means everything, particularly as Dan noted, the location of the boilers which would have plunged straight down like a stone.
The zig zagging you refer to was not side to side but a seesaw motion of the bow as it would plunge, tip up, stall, then plunge again. (Lather, rinse, repeat until the bow ploughs into the bottom.) Another point: The difference was not a couple of miles, the difference was thirteen miles. Seesaw wobbling up and down doesn't get you a variance like that.
There's also the matter of the Carpathia's hull form which wasn't even remotely capable of 17 knots even with all the power maxed out to the red lines.