How does that system work Dermot? When we used a shockcord in that way it completely ruined our light air performance. We used to tie it off to stop it, but it was a problem remembering to untie the knot before we had to douse.
I think that Terry is right, "Pull faster".
We seldom have trouble with retrieval. My crew is very fast - her arms are a blur as she drops the spinnaker, gets the boards down and is out on the wire in seconds.
My tackline is separate. The halyard runs from the spinlock through a block on the tramp and back to a block which runs on a length of shockcord, which in turn is tied between the toestraps at the back of the tramp. The halyard then goes through the back of the chute and up to the patches. We have a thin line which goes from the top patch to the head of the sail to prevent stretching when pulling.The halyard rope is just long enough not to pull on the retrieval side of the halyard in light winds and spoil the shape of the spinnaker.
I haven't had to think of this before because we do not have a problem, but maybe in strong winds the spinnaker blows out in front of the boat and does not drop in the water. And in light winds, the shockcord is strong enough to stop the halyard dropping too quickly.