While the drogue is deployed, the drogue link carries its load, which is transmitted through the link into the plunger within the gas shackle, which is mounted to the seat structure.
OK, for "lug" read "plunger". The point being is that at release the drogue shackle bolt no longer has to pass through the jaws of the scissor shackle, it is released by the plunger. I believe that if over-tightening was a problem then it would have been mentioned in the SIL.
DV