I almost always draft what I will consider my #1 RB round 1 - any RB in the "top ten" on my list. I see you're clipping top tier at 4th pick but I think that's a little two narrow. Rice, McCoy, MJD, McFadden... all quality backs for the 1st round.
I also draft a "2nd tier" (10th to 20 on my list i.e. Gore, Forte, Hillis, Moreno...) RB round 2 to be my #2 RB Starter.
#1 Starter WR round 3. Usually get a guy in the top tier (top 5th - 12th on my list).
You can see I draft my key critical "starting lineup" right out of the gate. RB, RB, WR, Flex, WR, QB, etc.
Thank God for Football Season.