You mention backlinks for seo. I would expect most submission based websites use nofollow links thus providing no link juice. Can you comment on how many of these 100 sites do or do not use nofollow links?
One idea I've had is to stagger the post based on how the site's traffic gradually drops.
If you have ever seen the end of the movie The Core, they use the energy of the bombs and create a chain reaction to keep the earths core moving. I'm sure the science is sound...
In doing this you could keep the project moving over a longer period of time rather than a big bang which might fizzle out.
Interesting but without sharing more about the websites where you publish or the number of subscribers you have to your list I wonder how people can trust you.
OK, I've decided to publish the list. The value is not the list itself but that I do the work for you. Instead of creating 100 different accounts and entering the same information so many times, just do it once and we'll do the rest for you.
I've sorted the table of websites (over 150) by their domain authority and I work the list from top to bottom. The highest ranking ones are in the 90's (100 is max) and it goes down steadily.