Blunt
I first had the s-flex 1900rpm fans on a push pull config with my TRUE and they worked very well. Sicne then I moved to 2 ultra kaze 3000rpm fans. They cool much better and have much better static pressure due to the 38mm deep fan shroud. They are loud but work very well. I would recommend lapping the TRUE and pressure modding it, at least use a washer to put under the mounting bracket to push the TRUE down onto the chip. Without the pressure mod the heatsink can spin around easily on top of the processor IHS. But I would try and get 38mm thick fans, and then maybe slower speeds if you want quiet fans.

A question, does the UD5 have any points on the board where I can plug my mulitmeter into to read the voltages of the Vcore and IOH and other components. I did not see any laid out like some boards where they are labeled, but if anyone knows where you can take a read from let me know.