CSAT/NPS in comp plans

Curious is to how others measure CSAT and NPS scores into comp plans. How to you approach the following challeges:

1. No response from customers ( mark it as a negative response?)
2. Customers who have 1 strong respondor only vs. customers with multi reponses - scews the result.

Are there any criteria you put into place for the calculations?

Thanks,

Effie