We have a better option!
I can alter the cable lengths of the buoys independently.
So the DIFAR will be Shallow-40, Deep-400 just as it is now.
But the VLAD will be, tentatively, Shallow 600 or 800, Deep 800 or 1200 reflecting their deep-water only capabilities in real life. I still have to decide the exact depths, but the depths OS suggested seem right to me, but maybe a little too deep for gameplay.
So we can have it all!