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The resistors are under the cover, but I really don't think they will have any effect on linearity. I believe they are damping resistors to prevent ringing. I'd leave the cap alone too.
The magnets won't have much effect either. They are for centering and horizontal linearity correction.
The vertical linearity control should have a very, very noticeable effect. It also interacts with the height control so you'll need to go back and forth with adjusting them to get the best linearity at the right height.
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