Disclaimer: I haven't used any of the SSR polishes.
I wouldn't use 1Z PP (somewhat aggressive) after SSR1 (very mild). 1Z PP has even been known to leave some micromarring on some paints. It works fine by PC, but it's not something I'd use after the SSR1. In fact, I always follow 1Z PP with either 1Z MP or 1Z WPS. Either of those would be a good last step to fill remaining problems, but I'd probably use them *instead* of the SSR1 rather than after it.