CM -
The Snohomish pink might be able to provide some insight into the questions that are asking. There was a major change in the escapements pre and post 2000.

Since the 1950s the basin escapement goal has been 120,000 spawners. In the 7 pink cycles immediately prior to 2000 the average escapement was 135,000 or a bit above the escapement goal. In the 7 cycles immediately after 2000 the average escapement was 1,185,000 or nearly times the average prior 2000 and nearly 10 times the escapement goal.

While I don't have access to the total run reconstructions of either Snohomish Chinook or Steelhead there is access to the spawning escapements. Looking at those escapements for the years impacted by those prior and post 2000 pink escapements should provide an indication in the effect of that size of pink escapements. One word of caution since 2000 the over-all exploitation rates were lower for the Chinook and steady or lower for the steelhead.

The average Basin Chinook escapements (NOR) for those years likely to influenced by the pre-2000 pink escapements was 4,858. The average of the post 2000 pink escapement influenced was 5,159.

For the Snohomish wild winter steelhead, the average escapement for those available years influenced by the pre-2000 pink escapements was 5,578. The average for the available years influenced by the post 2000 pink escapements was 3,476.

Curt