Sure, sstr=10 is insane. The default settings for cstr are adaptive to sstr. Effectively, cstr is "tearing down again" sstr, by applying the reverse of sstr's lowpass. The higher you set sstr, the higher the default cstr-reduction will be. That's why you should rather decrease cstr, instead of increasing sstr.
And again, this filter is meant for realtime playback. Not for encoding. The filter cares a crap about small hi-frequency artifacts on a per-pixel level. During normal watching, you probably won't notice them anyway. The encoder, however, sees each and every darn pixel and has to deal with it.
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