Clanking sound from rear air suspension.

[Cutstruts]

Alright so I just recently installed Flyyair air suspension with air lift 3p. Only issue Im having is that the rear bags have no height adjustment and the strut does not allow you to set enough preload to close the gap between the top of the bag and the frame. This is causing me a clanking sound from both rears on any kind of bump. At this point I just want to find a solution because it is driving me crazy and making me start to hate my air suspension. Someone please help.