So I don't claim to know the exact answers but here is the best of what I understand. 1) the amount in parenthesis is like a temporary donation of steem power from the whales to give you a boost of steem power in the beginning.
2)Powering down will transfer your steem power into steem dollars over a 13 week period.
3)I believe your reputation (yours is 37) determines how your posts will be shown. Steem power helps you earn more rewards and determines the worth of your votes.
The amount of steem dollars you have is the amount of steem dollars, not the worth in USD.
I don't know about the savings row or why the 2 cryptos but would love to see someone comment on that.