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Lets distinguish between lapping and refreshing a hone.

Lapping is when you are making sure the hone is flat and use the pencil grid trick. That I do only when the hone feels it needs it.
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IMHO, stay with just the 4/8 to start with. Learn what it is capable of doing to your razors. Learning to use the 4/8 to bring an edge to shaving sharpness is required before you can really benefit...