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Resistors being out by 5 or 10% is not the source of your problem. They could be out by 25% or more and not cause this problem.
It is the horizontal deflection circuit and the magnetic fields.
Make sure you have adjusted the spring loaded mounting screws for the focus coil correctly. That is how you center the image.
Make sure the yoke is seated up tightly against the CRT.
Make sure the CRT is centered in the mounting.
Make sure the ion trap magnet is in the correct spot - it will interact with the focus coil.
When you move the trap magnet around, the whole image should shift and possible distort in the corners. Same goes for the focus coil.
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