I am a firm believer in equal custody time except in cases where it can be proved one parent is unstable or cant fulfill the 50% time. Kids need both parents. Our society suffers when kids are brought up in single parent homes.
If it was me facing 3 hours of time with my kids once every 2 weeks, I would go to trial. You say your L has 35 years of experience - good - I am sure she can help you get parenting time that is in the best interest of the kids.
I really believe your STBXW is doing this just for the sake of more child support.