In LF I don't bracket exposure - I bracket developing. I (usually) shoot both sides of the holder at exactly the same setting. When I get home, I unload all holders and develop evey second negative in the stack (I have a vague idea of which order they're in). If the first negative is good, I develop the second one the same way - just in case one of them is scratched or fingerprinted or something. If not, I look closely at the first one to decide what to do with no. 2.

Sometimes I'll use the second negative for experimenting with new mixes. If I know the first one is good in developer A, I will try it in developer B. It is interesting to see the differences in tonality and "structure" between different developers...