I strive for BBS every shave. but, now that I am a newbie with the straight I'm not so fussy..
funny thing, with DE's must have BBS, with the old cartridges/fusions must have BBS.. even when I first started with the Str8 I finished with the DE to get BBS...
now months later my technique is better with the str8 and I no longer finish with the DE and only have BBS on some parts of my face...cheeks, neck. just the chin and upper lip remain with a DFS but not BBS..
However I've learned to accept it... for now.. see what more times brings...