just put the corbin classic solo on seems to sit me back more than my sundowner did also have the floorboards moved up and out stretches me out nicely. the seat seems comfy right out of the box and should only get better with time. dont know out the rack TP issues yet.
looking at your setup, i don't see any way that you could fit the solo tourpak rack on there. but i could be wrong.... i just don't see it.
Here 'tis all loaded up. BTW...the Mustang doesn't sit me too close. My legs aren't the longest, but I do have pretty long arms...I think you'd be pleased w/ the setup. Mustang does let you return seats if you need to. Very comfortable on long rides...love the backrest too.