Viewsonic n2750w DVI issue

I have a Viewsonic 27in n2750w LCD that I use as my monitor. This has been historically setup at 1280x720 via VGA with crystal clear text and graphics. I recently got a new card with DVI output, but 1280x720 does not properly display (a little blurry with distortion at left edge). 1280x768 will display at 1:1 in DVI, but also a little blurry and not at the clarity of VGA 1280x720. I am pretty sure 1280x 720 is the native resolution, so I am not sure why it won't display correctly through DVI. There is some chatter on Newegg about some units having a 1360x768 native res, but neither VGA nor DVI works at all at this res.

Does anyone have any experience with this monitor and getting a clear resolution using DVI? I guess I can use a DVI to VGA adapter and hopefully make this work, but would prefer not to if possible. Thanks in advance for any help!