I am shopping for a pack for my wife. The challenge is that she is 5'0 with a torso size around 15.5 inches. I took her to REI–the REI Flash 65 Small was too big for her torso, but Gregory Jade 60 Extra Small fit her pretty well. I am assuming the Jade 50 will fit just as well.
Then she tried the Deuter one-size packs. The fit of the Deuter ACT Lite 60 + 10 SL (women's) pack was even more comfortable than the Gregory. However, after climbing the stairs with 25 lbs of REI pillows stuffed in, she noticed it was way too top heavy. This was clearly because the torso fit system had to be set at the shortest setting, pushing a ton of the pack above her head. She then tried on the Deuter ACT Lite 40 + 10 (men's / unisex) and while it didn't seem as top-heavy, it was difficult to tell because the shoulder straps were so comically wide for her. Unfortunately they didn't carry the Deuter ACT Lite 45 + 10 SL (women's), which I am now looking into.
My question is: with these one-size packs, with the torso system cranked to the smallest or second-smallest setting, are the smaller packs built so that more of the weight can be comfortably carried below the shoulders? As far as I can tell, packs that come specifically in small or extra-small seem to do a better job keeping the pack from towering above a short woman's head. It'd difficult to tell from mere pictures whether this downfall of one-size packs is lessened in the smaller models.
Any wisdom anyone has to share is much appreciated!

