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PFD is the way to go, once you pay them the money, they won't work with you at all.
I have no luck with GW Letter at all ( Citi, BOA , Discover) all rejected my GW request ( I have to wait out 7 years I guess, but other factors improved the score a bit). So If you can get a PFD, thats your best option for you.
Edit: didn't notice that it is an old thread, somehow I run into this thread.
2013 Feb EQ: 550 | 2017 Feb EQ: 722