With base tilts the "rule" is focus for the FAR (the bottom of the ground glass) then tilt for the NEAR (the top of the ground glass). After the first try the FAR will probably need a bit of re-focus. Then the NEAR will probably need a small tilt adjustment. Just repeat the sequence with smaller and smaller adjustments until NEAR and FAR are both sharp.
With centre tilts I focus on the FAR and NEAR and note the change in extension and then set the focussing standard half way. Then tilt until the FAR comes sharp and the NEAR should be sharp too. Some minor tweaks to focus and tilt may be needed.
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