I print combat maneuver cards for the players with OCV, DCV printed on them, but I use a 10+ mechanic to hit rather than a 11 or less. So for OCV 8, the card says -2 (8), because I pre-subtract the 10. So the character rolls 3d6, adds their OCV in this case -2, and tells me the result. This is the DCV they hit. I'm not a big believer in keeping DCVs hidden, but this allows you to keep it hidden if you want to and I just think this is easier.