Just a shout out to Brain, I attended one of his webinars last night. Brian is a master mathematician, using his skills and tools to help writers fine tune their advertising. His book "Mastering Amazon Ads" is the first step to getting your profits upright. He has a page here on Patreon: https://www.patreon.com/BrianDMeeks
He also has few snarky novels for sale for your escapist reading pleasure. And a secret passion for guinea pigs. Hey, you didn't read the here.
Anyhow. Thanks Brian, I'm looking forward to seeing your tool...