PACK IS NOT HEAVY ENOUGH!!!!!
hehehe
I just had to say that.
Ross is right on about the ALICE 'hip'belt,it is more of a kidney pad,which it is called too.
If you have a long torso like me,(even shorter folks can have a long torso),tho I'm 6'-4",the 'waist belt will ride high above my waist(frame length=20"),that's why I like the ALICE,it rides above my 2nd line gear,some of the weight actually 'taken' by my buttpack.The belt is closed when I want to stabilize the load,most of the time I clip it back to itself,out of the way.
The top of the frame is bent towards the body,this not only helps with padding but gives a nice angle to the shoulder straps if worn correctly.
For some youths and shorter friends and my "patrol pack" I have shortened the frame.
There is considerable posting by myself and others at geardo.com forum if you want to try and 'dial in' your ALICE.When free to make a few mods and change some straps ALICE can be made 'perfect' for anyone.
A member there showed how to hook up a MOLLE shoulderstrap set to an ALICE frame,which seems to me like the solution to the problems you are having.
Also the gear forum at assaultweb and lightfighter forum have extensive ALICE posts with pictures if you're serious about learning some tricks and tips.
There is alot more to wearing a pack than straps,,,Loading an ALICE pack is an ARTform,especially in the .MIL,where the load is usually heavy,oddly-shaped and hard.As soon as you add webgear,or concealable armor or a shoulder rig,etc.under the pack,the 'fit' will change.
I personally would use a frameless ALICE only in an emergency,if I was planning a frameless pack for any purpose,it would be a pack that was designed for frameless use.
Even tho your BOB might be 'light'(mine sure ISN'T),if you are foraging,or plan to hit a cache,be ready to pack a monster load.
I show how to doubleruck an ALICE,which works if you want to split a larger loadout between 'sustainment' gear and 'combat' gear,if you think quickly caching a pack might be in your 'scenario'.
BulletcatchR