The problem every manufacturer here has is that the chambers and mufflers have to be interchangeable with originals and other brands.
If you jig the chamber to suit the original muffler you end up with the same droop.
I think I did change the stinger on mine a bit to lessen the droop but from memory the stinger tube comes close to the frame tube / shock / side cover.
Reasonable clearance from these must also be considered.