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Not sure about the author share but curator share can't be calculated, because it depends on the next curators and the last curator gets the least.

Author share is relatively easy to calculate. If I send 0.100 steem to your bot and it upvotes for an equivalent of 150% of that, then I'm getting an upvote worth 0.150 steem. 75% is the author share, which is ~0.112 steem.

My suggested text does not account for curation rewards and it explicits it is based on author share alone. We all know there wll be some curation rewards and that we don't know for sure how much it will be, so it's fine.

That's not really true. The author can get more than 75%. It depends on many factors like the penalty for curators within the first 30 minutes. I might change the description to something like this: Minimum ROI: +1%. Once the 150% ROI promotion period ends, I will change it to 126%. That way the ROI will be gauranteed to be a minimum of +1% and depending on how much curation rewards will go to the author, the ROI can increase up to 10% or even 15% or perhaps even more. And in the meantime, I will change the description to Minimum ROI: +25%.

It depends on many factors like the penalty for curators within the first 30 minutes

Curation window mechanics have been changed since HF20 was introduced, many months ago.

Roger that. It's apparently changed to 15 minutes.

That is not the only thing that changed, no. Author share never grows. A share of the curation before the 15m goes back to the reward pool instead of getting donated to the author. @msg768