This is your idea of NO contact? On her days, quit doing things for her. Go out and get a life. She needs to see that you are happily moving on even if it's just painting on a smile and going out to Starbucks for a few hours.
Stop talking R to her. She doesn't get it, won't get it and any convo will just leave you feeling like roadkill. Leave the money talks to your L. You are letting your emotions dictate too much in that area. You really need to reconsider HER plan of you being the primary parent, doing all parental duties and yet, you pay her child support. The only thing you will be supporting is her single lifestyle. You need to do what's right for your kids. Fight for them, not her.