When you're getting bounced around in in cruise in IMC flying a precise heading and altitude just isn't practical. The way I do it is to set up a box depending on how bad the turbulence is, but usually something like +- 100-150 ft and +- 5-10* and just try to keep the plane within that box.
If you're in cruise, you have plenty of space all around you, and noone is going to care as long as you keep it fairly close to where you're supposed to be. If you spend the whole time fighting for +-20ft and +-2* then you'll wear yourself out for no good reason.
The bigger the turbulence, the bigger the box. Save your concentration for when you're getting your ass beat on an approach.
If you're in cruise, you have plenty of space all around you, and noone is going to care as long as you keep it fairly close to where you're supposed to be. If you spend the whole time fighting for +-20ft and +-2* then you'll wear yourself out for no good reason.
The bigger the turbulence, the bigger the box. Save your concentration for when you're getting your ass beat on an approach.