wish I had a Scout to post some pictures of this setup, but here goes...
Short straps go between the top of the scout and the back of the harness. IIRC, the Scout is set up with adjustable ladderlocks at the top. I would recommend abandoning that adjustment. Thread the shorties through the ladderlock so that the metal 3 bars are caught in the ladderlock. Then thread the other ends through the 2 1" tabs on the back of the harness. This renders it adjustable, but not as prone to slippage as if you use the ladderklocks to adjust. The mistake most folks make is leaving this portion of it too long. What you're looking for is the bag to hang in such a way that the top of the pack hangs about an inch off of the back when the hipbelt is fastened but the delta straps aren't. Then when you cinch the deltas, it should pull the top of the pack forward and take most of the weight off of the shoulders.
For the longer straps, thread them through somewhere around where the delta straps take off. I don't remember exactly which loop or buckle it is, but it is somewhere around there, about halfway up the pack. You don't want the bottom straps terminating at the bottom of the pack like they did when they came from Kifaru. Then thread the free ends through the bottom front of the shoulder harness and you're done.
If this description doesn't get it, I'll lean on one of the guys who has one of these harnesses on their Scout for some pictures.