The pea method is not great since it spread out in a circle, so the edges and corners are not covered. The line method covers a lot more of the CPU. Those idle temps are a bit high. On my i5-3570K with AS5 and a Hyper 212 EVO (same thing as a 212+, but 2C cooler), I get 30-35C. I think the heat sink may not be sitting snug. Turn all the screws, a little bit until you feel a good amount of resistance.
You realize this is an i7 not an i5 so temps aren't comparable. Just checking.