(apology for the lack of Chinese fonts in office)
I am no expert in this topic but will suggest you formulate the
question and post it on Quantitative Finance of StackExchange.
http://quant.stackexchange.com/questions
A few practitioners used to surf the site in a boring day.
(and a may-or-maynot related answer to MBS hedging)
http://goo.gl/pXoODj