Hi,
first of all you have have a very nice collection, good taste on every one of them.
First to address the downscaling:
As you say you are not a fan of any gold (me neither), so I think you should stay with 10 pieces. All of the ss watches that come to mind would be either PP, VC or AP. I would rather own 3 Rolex watches for any ss entry level PP as you have the same quality with more variety.
For the last two slots:
An AP RO dresser (maybe the ultra thin) would suit your collection and as others already said, the collection needs a dressy piece. Looking at your collection and your profile pic, I think you should stay away from JLC, Breguet ... for at least some years. At least I am saving this stuff for later years (Reverso after I am at least in the 50s). Now we need a sporty dresser, this is exactly what the AP is.
Also a Planet Ocean would perfectly replace one of the subs.
As the last watch I would pick something like a Grand Seiko which brings a exotic variety into the mix and also says that you not only am the one buying watches for their name/reputation (Rolex, ...) but are a real afficionado.
Just my 2c.
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