I'd be happy just using the 2nd tier. 1.5x is good by the time I get to hatching all five. This time, the fourth popped while the Lv.1 O-Power was still active.
I'm stubborn too, but also like just being able to hold down the right button and ride right in the middle of the path, where you don't encounter anyone riding around the tower.
Also, used Hatching Power this time. Two Orbs? I like.