thanks. I also use the sleeve-in method, but only when not using the garment bag. And the result is better than with the garment bag, unfortunately.
As far as my jacket: I store the suit in the suit compartment, and put everything else outside this. It was a two days travel, so I only had a Tumi shirt folder/organizer with few shirts + one pair of casual pants which I laid over the suit compartments (perhaps I should have added it inside the suit compartment instead?). Nothing more, since ties, toiletries, socks, underp go into those two little bags into the suit compartment.
If the point is to have just the suit and carry everything else in a different bag, then i cant believe people buy this thing. For this reason i believe there is something i do wrong, because it's impossible a bag fails like this.
At the same time though, i think that if the bag folds the suit in two, obviously there must be a crease in the middle.