I couldn't find any good pictures of the Giant Loop heat shields installed on a 990 and I stumbled across this thread. Radek your picture was worth a thousand words as to where the rear panel would be baked on a 990:)
I really like the GL great basins bag that is tried and tested but I may go with the 2014 ALTRIDER luggage (seen in Vendors section)
So it got me hunting around my garage for a better heat shied option that what I had seen so far and I found a CF Zeta heat shield and mounted it up. Might be a few $ more than the GL shield but it's smaller and lighter and fits like a glove where the bag will force the plastic to hit the section of header pipe.
Just another option for people interested.