Welcome to our forum.
Sounds like you and CC are experiencing some NRE (New Relationship Energy), and you and Peaches are experiencing some RRE (Renewed Relationship Energy). If you keep the lines of communication open, you'll be able to get through the bumps.
I'm glad to hear that Polyamory.com has been helpful to you so far. My best wishes to you for that to continue.
Love means never having to say, "Put down that meat cleaver!"