[old guy]

crosshatch angles are important as the depth and angle,determine how much oil is retained on the walls and the rate of ring rotation.
not enough angle and the rings will rotate too slowly and not disapate heat properly,while leaving too much oil on the wall,allowing the rings to skip over the surface and cause oil consumption.
too steep on the crosshatch will not leave enough oil on the walls and can cause excessive ring rotation that will wear out rings and ring lands prematurely.
most manufactures specify a 22-32 degree angle, uniform in both directions.
can you hone your block at home?sure, but expect results comensurate with your methods.