Oh yes, the dreaded "lawyer estimation"
I remember that - when it was "estimated" our Ch. 13 payback would be "no more than" $450 a month at the first few meetings - then it actually jumped to $600! Talk about a shock to the system! When questioned it was stated "nothing is permanent until the paperwork is completed and reviewed by the Trustee" - i.e., 2 amended schedules later due to attorneys errors.... 
Hang in there -
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