Kenny,
I just stumbled across this thread on your build.  Cool!  It is looking good!  As a former Submariner that served on two Trident boats (Maine and Nevada), I am particularly interested.
So often, I've seen waterline models of modern US subs with too, much showing above the waterline.  You are doing it right, here.  The rudder should be an entirely separate piece mounted to the water base separately.  I think that others have taken short cuts in their displays and didn't cut the models right, like you have.
What is the hull number of the Louisiana?  I didn't know that there is such a boat but, I don't know everything.
Along with Rui's suggestion about color contrast............I have found that using Grimey Black by Polly S and then a darker Flat Black wash could work, in leu of a dark gray.
I have often entertained the idea of making a harbor diorama of the Delta Pier at Bangor, WA sub base or even a dio of the shipyard at General Dynamics Electric Boat Division in Groton, CT.  Your work, here, reminds me of those ideas.
I, along with everyone else, am looking forward to the final result, here.