Hi Keith, the 'OFF' position is applying no artificial damping, so it shouldn't be difficult to turn the wheel at corner entry. Using positive DRI numbers will feel easier on turn-in because this is adding an artificial acceleration on the wheel (generally not realistic). Using high positive numbers of the DRI setting (particularly +5!) is a pretty unconventional choice for anything but drifting (and even then, it's not necessarily a good idea), or if it is used in combination with very high damper values. Having an artificially fast rotation during oversteer can be useful (in terms of catching a slide), but it is counter-intuitive to use it to reduce the wheel weight on turn-in, unless the force feedback of the game you're using has a severe 'overdamped' feeling. If you find there is too much resistance on turn-in when the DRI setting is 'OFF' or in the negative, then I recommend that you try turning down the overall force feedback strength in the game, rather than artificially removing it with the DRI setting.
The 'OFF' and negative values on the DRI setting are where the car steering will feel the most realistic in the vast majority of simulators. I typically set a CSL Elite wheel base to -3 or -2.