Are you adding them using Dism?
How are you manually installing them once booted?
Did you try looking at log files?
http://technet.microsoft.com/en-us/library/ee851579(v=ws.10).aspx
Topic: Easy2Boot
Date 15/12/2014
By SteveSI
Subject Re: Re: Re: Installing Windows 7 From a (Removable) USB3.0 Flash drive
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