These photos should illustrate the issue.
With the bag on the rack, the bag end of the clip is already touching the grab handled. With the strap attached, it is simply not possible to secure tightly to these handles. There will always be slack, and the bag slides back, ullung the straps even further back on the handle to the point that the rack is no longer inside the cup on the bottom side of the bag.
Once again, my solution was to attach the loops of the straps to the hooks under the rear seat, which is further forward, and provides forward tension on the bag, holding it in place.
If the straps were sewn in higher in the bag, strapping to the handles may have been an option, but this is not the case.
Using the longer straps on the rear, I can secure it even better, strapping to the rack, under the bag.
Overall, the design of the bag could have been better. Yes, the bottom of the bag is designed to fit in the rack, but the strap clips are poorly positioned to secure it properly. I would also like if there were some additional D rings attached, other than the 2 for the shoulder strap, for even more versatility.
I hope this clarifies why I originally posted.