I'll jump in.
The J-pipes should not be touching or near anything, other than that, they just need to be tucked up in there out of the way.
As far as adjusting them to suit your individual car's drone range (MOST are fine with the factory settings but there are always a few g8's with different tolerances that might need tweaking of the J-pipes to make it work for you!)
http://www.g8board.com/forums/showthread.php?t=28831
^^^ That's the procedure for adjusting them. Basically, create a test loop where you can easily and verifyably prove the problem area. Then mark and make adjustment as in that thread, then repeat exact same test loop? No difference or worse? You went the wrong way on the tuba-section adjustment. Better? you're on the right track, try another 1/2 inch and repeat test loop, repeat until perfect. When done, crank the clamps real tight again so that they don't shift or move after you've found the sweet spot.
After adjusting, let us know how it turns out!