Hi I am a beginner hiker and am having a difficult time finding a backpack to fit.  I am tall, 5'8", but have a short torso, 15 1/2" and ample bosom 38".  I have tried on at least 25 packs at my local outfitters and "settled" with the Osprey Renn 65, though I am going to return it because the shoulder straps still sit above my shoulders and dig into the sides of my breasts.  Any advice on steering my toward a pack that might work?