althaz,
I am not sure I understand exactly how you mounted the HSF. Did you drill and tap to mount to the tray?
I presently have a big typhoon using bolts with fiber washers through the mobo holes, not using the bracket at all. It works fine though I have always been a bit leery of the strength of this mounting and possible stresses to the board.
Would you explain in a bit more detail how you accomplished your installation?
Thanks