I have found the MBM is hit or miss on accuracy. MOst of the time it is fine, but once and awhile it conflicts with the sensor and yoiu get a crazy temp likr -3994 or something weird like that. You could use your BIOS to check you temps (i find those to be the mostr accurate) Using a front display is great to check you ambient temps of the Mobo, but as for checking the CPU they ussualy are way off. I would not be worried aboutyour temps at their current state.
Sean