Apologies for the late reply.
What is the source of the offsets? How were they faired/lofted?
If.you are using lofted lines then the construction material must be taken into consideration.
I have lofted patrol boats full scale and an aircraft carrier usimg Rhino. In both cases the design office offsets were in error by several centimetres.
As someone else has said it is important not to let the computer fair the surface, or attempt to use too few surfaces.
Looking at the images; the stem plate is critical because it appears to have a radius in plan thus the curve of centres combined with the stem profile will give the tangent line on the shell. This provides the foremost edge of the shell surface -not the stem!
I hope this is helpful. You need to think aboit how you would build it and when you get it right it is obvious (and easy)