Found one more SOO for Series 2, but since DC stopped running them in 1988, this is all there was. Still, it shows that the Perez run was a HUGE jump forward in sales from the previous series.
1987 Wonder Woman #15 SOO 118,550
Also, thanks to the Standard Catalog of Comic Books (2nd Edition), I found some Capital City orders of almost all of the Series 2 issues. These are ONLY one distributors' orders, and did not factor in orders from Diamond, Heroes World, Second Genesis, or others, nor newsstand sales. My bet is that these were probably around 1/4 of total sales.
The CC orders do, however show trends in sales. I've marked a few spots where artist changes were made. Surprisingly, while sales declined after Perez left the book, it was not immediate, and Perez sales were often less than 1/3 of when he had started. The Deodato sales didn't immediately pick up, but were rising already before "The Contest" issues, and peaked as those showed up. And Byrne's sales started strong.
I tried to add these CC orders into posting #2 below, but was unable to due to too much material, so it's in this post. You can now see SOME figures for all but thirteen issues. It isn't likely that Diamond will ever release their numbers prior to 1996, and the other distributors are out of business, so this is most likely the closest look we'll ever actually get at sales.
Still, I'll eventually do a lot of digging in storage to pull out old Capital City Internal Correspondances and catalogues, as well as Diamond and Heroes World catalogues, to see if I can find more sales figure. Don't expect that to happen anytime too soon though!

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