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The 1/3/8/12…20 progression is perfect, you won’t need the 5K.

Surprisingly with modern synthetics you can, in the high grits, make large grit jumps, just fine. The 20k seemed excessive to me. But...

So, performance wise, you will see no improvement over what you have, except the 12K.

The Chosera 1k is the Gold Standard, especially over the King, performance is the same though, I’d wait and...