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Linearity, height and centering all interact. Getting vertical right involves having one hand on height one on lin, and occasionally tweaking centering in most sets.
If playing with both controls at once don't give you a good linear raster that fills the screen, try tube substitutions and confirm all resistors in the vertical are within tolerance.
Note: if the horizontal over scan is much greater than the vertical and you want to further increase the vertical to prevent the image from being horizontally stretched, there may not be enough vertical range to match....If that is the case you may want to try to reduce the horizontal size (if no such control exists try H drive, H out/damper tube substitutions for weaker working specimens, or sliding a thin sheet metal copper sleeve between the yoke and the CRT neck) or live with it as is.
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