I'd like to reduce the significant child support I pay since the kids do not want to spend time with EX(they are teenagers)

I have both kids home almost exclusively except every other weekend. The judgment seemed very unfair to begin wi considering I have physical custody and she has what amount tovisitation, but the judge seemed very prejudice against my attorney!Now 2 yrs later the kids are with her even less. She seems to make more money but Im not sure how much until disclosure (she is self employed). I spent almost 10K to get wrecked by the first jud /lawyer and am court-shy but this is horribly unfair way to allocate our family finances. I don't know what she makes but she now has investment property too. I wonder : if start a motion without knowing her income HOW hard is it generally speaking, to show "a significant change of circumstance" if I already have physical custody ? Must my kids give statements about the fact they don't see her for midweek dinners anymore?I really can't spend several thousand dollars on this so need to know if my chances are any good