MS Sync Framework for BLOB data

I am using MS Sync Framework 4.0 toolkit in a Windows 8.1 XAML application. Using SQLite as local database. I want to sync files between SQL Server and SQLite. I have tables with VARBINARY(MAX) data type. I am following this tutorial to achieve the sync process.

Is this right way to sync files between WinRT client and server? Because I am facing many problems like,

1. Initial sync took too long, if there are big files in server.
2. Uploading large file is not possible. I am keep getting Request entity too large(413) error, since WCF has 65 KB content length limit.