Hmm, they couldn't do a 7.5 bag in like 6in? I am ordering my DBag this week. I may just do the 7.5x10 because the rocketman 16' chute feels like it's going to pack bigger than a normal chute. Have an inquiry out to Fruity Chutes at the moment.
I sent Gene the dimensions and material of my chute, and he recommended the bag I got. As it is, my chute just barely fits in there.
Moving the bulkhead seems like the way to go. I think I may still have the internal bulkhead that came with it. I had to order the external separately. I can figure this out, but I'd like to see your pics, too.