I find this quite a hard question to answer as I cant really say i've ever had this problem myself. I've just always shot Av from I started getting into photography as I seen the Aperture as a much more important part to control in the camera than the shutter speed as really the shutter speed can be any range of values and still be 'correct'.
Could it be that when shooting in Tv mode the camera is selecting a lot higher aperture values than you currently are using giving you a narrower depth of field. So the shots you are taking are still out of the focus plane but within the acceptable sharpness range due to the higher aperture.
With Av and the aperture set wide open you would have to be a lot more accurate with the focus as the acceptable depth of field is a narrower than it otherwise would be.
Got any shots with intact EXIF to show Tv mode working for you and Av mode not working ?
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