to be more precise, if you really want to "balance" for example the tree farms, you need to:
1. list all possible tree-farming approaches
2. understand the design difficulty, machine investment, maintaince cost(including energy, labor and other items), output efficiency, output stability, etc. for each approach
3. for each approach, convert everything in 2. into a single "OPness" measurement. This must be of something that can be compared (for example, a real number)
4. Compare the measurement of all approaches, find the most "balanced" one (the one with lowest OPness)
5. nerf every other approaches to meet the OPness of the most "balanced" one
6. Some of them may be impossible to adjust from config files. Consult "Forge SMP modding tutorials" to deal with those "OP" approaches
7. Viola~