I can't see any real problems with what you're running. I'm running nearly the same setup, other than a homemade Big Momma like heater core and a 350 Danner.
I did however achieve 4c lower temps by recently re-making my fan shroud to allow an inch of space rather than only a 1/2" adapter, and opening up the grill in front of the rad. Maybe consider your're flow threw the rad, and if the air is flowing consistently? I heard some people getting better results by modifying / adding to the current Black Ice shroud, I think this is even now listed on Watercool-Overclock!
Also is the rad mounted to draw in fresh air, or have case air expelled threw it.
I now run about 46c max by ASUS, and 39c max by DigiDoc 5 right on the slug in a room with about 25c ambiant. This is with BIOS 1005a (which increased my idle temps nearly 6-10 degrees, but adds good features). Notice DigiDoc 5 is 7c colder than ASUS. This is partly due to ASUS compensating for there thermister mount. The DigiDoc shows temps raising and lowering probably ten times faster! Consider this, or a $5.00 ASUS thermister (used on P2B boards I think). Your board accepts one thermister on a jumper, and it reads as accurate as a DigiDoc, just can't see during a game. ASUS thermister needs to get temps with an air space to the radiated temps threw the CPU. A Thermister is mounted right on the side of the DIE. Pretty simple why its more accurate!
Also, I do as well crank the nylon nuts like RedLeader said all the way down. Be careful however to make sure to stop just before bottoming the springs. If you do bottom the springs you chance loading one side more than another, chipping your CPU or lifting an edge and killing your TBird, I know how fast this can happen.
Lastly, I get the same exact figures from MBM 5 as ASUS probe. Both are current. Maybe one has a software problem? I did notice if you try to run both at the same time readings become very unstable, is there possibly a conflict, or maybe other software interfering?
Hope one of these suggestions help, GuyBFF.
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A7V8X
Danger Den Maze II
Danner Mag Drive 350
Heater Core Style Rad
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512mb PC2700 CL2
Promise SX4000 Raid 5 w/256mb PC133 Cache
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