Congratulations on your 3 noms!
Some candidates only have the opportunity for one MOC nom per SA because MOCs in their state won't nominate someone who's already received a nom from another MOC. In some states, a candidate may have the opportunity get one nom to only one SA period (not one per SA).
In other states (especially those with few competitive candidates), there may not even be 10 qualified people in the state, let alone per SA or even per MOC. Thus, getting 3 noms isn't hard!
As others have said, it's about how you compare to other candidates on your slate. You're on 3 slates, which CAN help, but only if you're a strong candidate. FYI, if you don't get an appointment from the MOC's slate, you go into the National Pool. This is where being #6 on a super-competitive slate can help -- you still compare favorably to #2 on many slates.
In the end, it only takes 1 nom to be successful. I've seen many with 1 be successful and quite a few with multiple noms (even from competitive regions) be turned down. There's no way to read the tea leaves.