Draw a pencil grid on the hone, kind of like when you were a kid and played tic-tac-toe. Take a 325 grit 8x3" diamond plate, like the DMT D8C, or Atoma 400 (better but more $) and under the tap, or in a bucket of water rub the honing surface until the pencil grid is gone.
I like the Norton 4/8 better than the superstones, or whatever, of equivalent grit because they stay flat, and aren't affected by atmospheric changes, temperature, humidity. Only honing necessitates lapping/flattening on the nortons, while the other synthetics are always varying ....... IME ......... YMMV