Thank you for clarifying and for setting out the situation - I'm sorry that you have been through all of this.
You are obviously past the window for a successful appeal, and I don't think that is what you are seeking in any event.
You absolutely can't email the judge and ask them to justify their actions - there's simply no point.
You have had the court hearing, and at these hearings things can either go in your favour, more evenly or very much against you - obviously the latter is the case. Your solicitor perhaps could have been more robust in defending your corner here, I do feel.
The only reasons to overturn the judgment would be a material non-disclosure on behalf of one of the other party, or a substantial change in circumstances from the date of the order of the party burdened with the lion's share of ongoing maintenance payments.
The point is that the judgment may not seem fair, but if it's not made in contradiction with the powers given to the judge in law (I cannot see evidence of this) then it is very hard to come back to it this long after then event and ask for things to be redressed in your favour. Does this make sense?