I'm also having less than stellar (reported) temps on my WW/1048/amd rig.
http://forums.procooling.com/vbb/sho...&threadid=7420
What are your water temps at load? What program are you using for load (i.e. prime, cpuburn, toast) ?
How many turns over recommended did you crank the thumbscrews?
Where is your temp probe?
I didn't bother to lap mine, but I may try that next.