I think it is better to do everything in the service mode. That way, you have the maximum control and can minimize the point convergence corrections. When you save the settings, you also don't have to worry about losing them if someone does a consumer reset or if you have a power outage or other disruption to the consumer memory. Understand, however, with greater control comes the possibility of messing things up more, so only store the data if you are sure you have made an improvement that you want to keep.
The values themselves are mostly meaningless. You pay attention to what is going on with the image. I always center the positioning controls by measuring the dc offset at the output ICs an keeping it below about 50 mV. Then I center the image with the magnets on the yoke, and forget the numbers. They really don't matter if the image is centered and the offset is minimzed.
Other parameters need to be set for the best geometry and convergence. If you have one that you move and it has little effect, you probably have it out of range (they come this way from the factory many times). This is what causes inefficiency in the outputs. You want to back them off until you can see an effect, and make corrections in another parameter that affects the same thing, or live with the error. Many times, a nearby point, or a more general parameter will get you what you need.
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