@fieldsofgold I've read in a few posts that 50/50 have better earnings than choosing 100% for yourself. I recommend you look at @jerrybanfield account who has an airtable file about everything steem-related, it's like going to steem school. Just read all of his posts about steemit.
Your posts only accrue earnings for 7 days. I've never tried to edit the earnings part, but after 7 days it wouldn't make much difference.