i noticed the same thing too.
i am racking up steem power at a higher number the more sp i got
but dont forget to work on your reputation too
i wrote about it today
i wrote about reputation today
please have a look
https://steemit.com/steemit/@knozaki2015/steemit-has-introduced-a-new-reputation-score-what-is-it-and-how-can-you-boost-up-your-score