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If you experience issues with distortion, it's probably related to the intrinsic parameters, not extrinsic parameters. And, if intrinsic parameters aren't accurate, then extrinsic could be completely wrong!

Your chessboard is suspicious to me, the border shouldn't be made by half square. Are you sure corners are correctly detected?

Using 14 images isn't enough for intrinsic calibration, I usually used at least 50. I haven't tested the stereo calibration with few images, but I suggest you try it with 50 also.

Try to avoid the blur on the pattern, the accuracy will be better, and the detection faster (as the algorithm doesn't need too many steps to separate corners). Did you compute a sub-pixel accuracy after the pattern detection?