The Behr 1850 base has more sheen,(...the 1050 is Flat) and subsequently less of a viewing cone. timothy.c.porter was / is aware of such and was noting that in his instance, the loss of any "Side Viewing" capability isn't a concern. jsegura3, the latter statement parallels your own determination as well.
In the case of SS, anything that directs more light forward to the seating position instead of refracting received light to the sides means that the image will appear brighter. (...or as bright as it can be....)
Plenty of effort has gone out on trying to enhance SS with Top Coats (...much to Bcortez's dismay...) and virtually nothing worked to do anything except lessen the overall quality of the image or reduce it's extremely wide and acceptable performance value per dollar spent.
However, using a more reflective Base is an viable option, for it provides the SS tint with a better medium in which to reside and work within. For this most part, a base change won't irk the thread's OP as long as it's still a simple Behr product. But Top Coats, or the addition of separate reflective elements is not what the OP is trying to advance wit SS. As such, and although some such alterations can make improvements, any overt deviations should be represented in a separate Thread where they can be examined and hopefully exploited.
Butcha know....if one starts tinkering with adding more elements, and using different MFG paints for Bases, then it just ain't good 'ol Behr SilverScreen anymore. And when that happens, you've essentially graduated into the more advanced (...and expensive...) DIY applications anyway.
I'd suggest that anyone who needs to get in contact with Bcortez do so via PM. But be advised...Fall is "Brewing Season" for De' Man.
Why am I responding in depth to SS questions, and even defending such a simple DIY solution? Well, bluntly put, Bcortez once sent me some Home Brewed beer....and Brother Members....that counts for a lot in my book.