you should definitely shake the bottle every time with every juice. all the BWB flavors i've tried did need steeping -- including Malty & Vanilla Bean. sad to say, it takes almost a *month* for them to reach their prime. however, your mileage may vary.
another thing of note: BWB's flavors are *very* light in flavor in general as compared to most other vendor"s juices. i'm a big fan of theirs, yet, i've also been a big fan of Tasty Vapor, oddly enough -- as their juices are the complete opposite -- with "in your face" flavor -- it's almost as if you're actually eating whatever the flavor is supposed to be...
but, sadly, due to trying to my trying to cut costs on cartomizers, i haven't been using their juice lately -- as they tend to clog cartos *way* faster...they have a ton of fans on here, though -- who, apparently, don't care about the shortened carto life, as the juice is indeed, THAT good.