Given the descriptions of the ranges, I feel some adjustment is needed.
first, prevention of 0-3 in one success: While in reach of an opponent's readied weapon, each band is one square, rather than three.
Second, diagonal movement alternates 2 — 1 — 2 —1 etc. (This one I know from prior use works just fine. Ranges count the same way.)
Third, range band 4 should run to 30 grids, and band 5 to 100 grids (that's about 600'), and band 6 to 300 grids.
fourth, add more bands: 7 runs to horizon, 8 to province, 9 to region, 10 to rokugan. (Certain invocations can benefit from this.