moving the hangar to another position won't help. the main things that weight a lot in a warship are the weapons, the radars, the engines and the liquids (fuel and water etc)
as the last 2 are deep down in the in the hull, mostly even below the waterline, it is the gun, VLS and the structure with the radars in it that you should be playing with. decreasing the superstructure width would help a lot, as your radars are then closer to the centerline and by that give less moment to your ship.
the hangar doesn't matter at all when you consider that you will only be moving the helideck down if you go for conventional. the basic weight will by that not be lower (unless you make the amount of aircraft smaller, this of course works too)
for the bow: an good idea would be to look at similar ships. the zumwalt is an good one.
if the seashadow is not yet done, you can of course take that
for the zumwalt, well, they are building her already (I have seen construction pics) so I suppose her shape is pretty final. if it is not, you can update her later again for the definitive shape (hell, would not be the first time that happends, I have 2 ships like that laying around myself) IIRC, timothy has an good ref for her, and as I am working on some of her parts myself you can ask my help might problems arise too. your choice if you want, but with all her straight lines I have yet to see easier yet interesting ships. (I would do her myself, if she wasn't so damn fugly that I am afraid my screen might crack)