I see what you mean.
You will never have the real water rendering in any Silent Hunter, nor in any environment mod additional...because it’s impossible!
The water rendering is the harder stuff to model and render
Not to say our computers aren’t enough powerful for such modeling.
For instance, i’m Not fan of SH5 TWOS water (even if it’s not that bad)...nor SH3...the ones wich gets closer to the reality (to my taste) are still the FOTRSU/OM+OMEGU ones
That’s just programming limitations