T510 FHD display not bright enough

i prefer lenovo's matte finish screens--very little glare--great for business purposes. However, i use the laptop outside a lot and therefore need the brightest possible display, for use in sunlight, where primarily i'm using outlook and Word. In Feb 2010, i bought a T510 with the FHD (270nit; 95% gamut) screen, and it was perfect for outside--very bright and easy to see.
then my laptop was stolen! Insurance bought me a new one--same exact T510 (only with outlook 2010 instead of 2007) with same FHD screen. Problem is that it's definitely not as bright. i turned up brightness in windows and in thinkadvantage. also maxed out brightness in the NVidia control panel (which did nothing, since that's really for video playback), and i even have played with the color-saturation brightness and other levels in the intel HD control panel (which increased the display somewhat, but still not as bright as my previous T510--also tends to wash out the colors and makes outlook a bit harder to read).
also weird: about once a day, on battery, the display dims almost to darkness, then gradually brightens back up in about 20 seconds. i'm using max performance on all battery settings, so don't why this is happening. not a big deal, but i thought it might be connected to the above problem.
i talked to lenovo warranty/service tech, who had no other ideas, other than to return the unit--which i don't want to do, as i've now got this one all set up.
any suggestions, folks?
much thanks,
jeff

For the brightness/contrast changing:
http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T410-Screen-flickering-randomly-screen-cont...
or
http://forum.lenovo.com/t5/T400-T500-and-newer-T-series/T510-Nvidia-Optimus-amp-Intel-GPU-When-on-In...
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