I am sorry but your calculations are all wrong. The $ value you see on a post is the USD equivalent of the reward. They display the post value in US$ equivalent of the number of vests and then distribute it in steem based on the internal steem price .
So a $100 payout value minus 25% curation is $75. At 100% steem power if Steem is $2 you get paid 37.5 steem. If the internal price of steem is $0.5 you get paid 150 steem. This is why you see the $ post values change over the 7 days it takes for them to vest if the market moves a lot (as the payout is fixed in the number of vests not the $ shown )
If you choose 50/50 then you get 50% paid out in steem price and 50% in SBD. So 100$ post ($75 after curation) with 50c steem price would get paid in 37.5 SBD and then 75 steem).
The only way the post value differs from the USD value is if the SBD value is not 1 (as it assumes it is 1USD per SBD). So if the peg is broken to the upside and SBD is worth $2 , then it still pays you out the same number of SBD but they are worth twice as much. So it is best to choose 50/50 if SBD is trading above $1 otherwise it makes no difference to the payout.
You can check your payouts here https://steemworld.org/@honarparvar and also the internal steem price which is a weighted average so it takes a while to catch up to a fast moving market.
🤔 same thing I read... STU is equivalent of USD, right.
if STEEM is above 1 USD, 100% powerup is better.
No the steem price is irrelevant. As it issues you steem based on the USD equivalent. (Ie 5 STU is 5 steem if steem is $1 and 10 steem if steem is $0.50, and 2.5 steem if steem is $2).
The only market variable that matters with respect to payout is SBD as it assumes it is worth 1$ and issues them accordingly when in reality is it is not a perfect peg an frequently breaks to the upside.
and when SBD is below 1 dollar...?
Well SBD below one dollar in theory is better 100% power up. But SBD normally stays at close to one dollar as you can redeem it for 1$ worth of steem via a blockchain conversion so it keeps a floor. It takes seven days to redeem however to at times like the moment when the markets are moving fast it can fall below a $ .
thanks, i have to correct this post 🙇♂️