Secondaries.....

When the secondaries are hanging like this, it is only usually a couple of things.
First check out if the shafts and butterflies are binding, that is the death knell for those secondaries,
The other common thing you have already found, somthing in that diaghpram/spring build up is a problem.

The other things to check is something inmpeding it which is pretty common in that secondary area.

Good Luck,

Bill White
White Automotive