How old is Biggie? As I have seen, each dog has a different potty ritual. Some sniff long and hard before choosing a spot to finally go. My boy sniffs, does a 1080 degree spin before finally going.
Would you consider placing a second pad? That way he has a bigger target, and with tons of praise he'll understand that the pad is the only place for him to handle his business.
The eating the poop thing could be a start of a bad habit, or a sign of poor diet. What food are you feeding him?
Grocery store type foods are the dog equivalent of human junk food. Sure it tastes good but it has no or little nutritional value. Some poor quality dog foods smell and look the same going in and they do going out. Some dogs eat poo in an effort to gain more nutrients.