I don't like advising things I've not tried myself first, especially things which may require some tweaking to get best results
Did you try mailing the guy on that other site who tried the WM8716?
http://www.head-fi.org/forums/f7/wha...5/#post4234581 I don't even have a TC7510 so can't try anything out, maybe he altered the filter to be suitable too
BTW, try and ignore the bitching etc on that site