I tried the shared custody thing for 4 years, but after being the primary parent, the one that went to the school conferences, that bought all his clothes, paid for all his school supplies, all his school sports, ran him around to events, (sports, homecoming etc,etc) and still paid child support to the ex (shacked up with her boyfriend), I decided enough was enough. I hired a decent lawyer made the ex an offer and got my decree changed. The three of us in my household are much happier and I save a huge amount towads my son's collgee fund.
Think about what will happen down the road and save the agony now. You are the best parent, do the right thing.
Thirdson