Public Folder Migration - toomanylargeitemspermamentexception

Fatal error  toomanylargeitemspermanentexception.

I have 20 GB of Public Folders to move. This is my script.

Exchange 2010 to Exchange 2013 on-premise Migration.

New-PublicFolderMigrationRequest -SourceDatabase (Get-PublicFolderDatabase -ServerEX2010) -CSVData (Get-Content C:\PF-Import-File\PFFolder2Mailbox.csv -Encoding Byte) -AcceptLargeDataLoss -BadItemLimit 40000

No matter what I try I get to 95 % and fail. I have broken it into several Mailbox Folders, changed bad -item limit, etc.

I cannot find the large files in public folders because there are too many of them. I assume I must remove the items larger than 35mg before I can successfully move the PF's.

Is there a way to increase this limit or a script I can run that will tell me the large items in Public folders?

Thanks