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Thanks. That's what I thought too...

Also author rewards are much less than 75 percent in reality...

I think that's because of the 50% calculation you have to add to that 75% I think

Does this mean setting the post payouts on 100% SP as opposed to 50/50 is more beneficial?

hmmm no, well it depends on the price of STEEM/SBD, but generally I think is better 50/50 because you can then use the SBD gained to pay winners on contest or just make transfers. SP is much harder to use

That's my understanding too.