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Unfortunately, the arbitrator essentially has the same authority as a judge as you agreed to that.
So you cannot make demands of the arbitrator anymore than you can of the judge.
The decision has been rendered and so your only choices are to appeal it or accept it.
You can self-represent for the appeal and not pay legal fees but if you lose the appeal then you will again be stuck with a chunk of your former spouse's legal costs.
One thing you may not have considered is whether there had been offers to settle. If there had been and these were submitted during the cost arguments then the explanation as to why the award went this way likely relates to the offers and not the mixed success.
No he doesn't and this is likely deliberate as it is harder to appeal when there are no reasons.