I don’t believe a B20 uses a PCV valve, at least mine doesn’t. As I recall the B20 has a reverse flow that a B18 does. Remove your PCV valve and double check the hose routing with the SW-EM article.
As to the flushing, given you’ve removed a lot of rust, there “may” be more in there. When I flushed mine with a garden hose, likely 20 complete flushes, garden hose in thermostat opening, and draincock removed , I got what you see in the picture. This was probably only 50% of what came out, and while I didn’t get it all only small amounts were coming out on the last few flushes.
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