Neither Price or Miller need to be shored up. Price already represents the most Democratic majority white district in the South. Miller drew his own seat and can't really be made more Dem, add more of Raleigh you just have to shed parts of Raleigh or Greensboro. You can't shed the rural counties because they connect it. I don't see how to even draw a 55% McCain district with this one.
you take the Outer Raliegh areas, like th 4th district's part of Wake County, Johnson county, and move it back towards the 3rd district areas. The 13th and 4th basically just take all of Durnham, Orange counties, most of Wake county, and the North-central counties.
Remember, this would be an incumbent-protectino plan, so there's no reason to leave the swing/republican areas in the 4th or 13th district while leaving some Democrat-leaning ones in the 2nd.