I would think that you could consider these factors:
1. Type of cooker your using. If you aren't using a water pan type cooker you could add a small pan of water to the cooked to make a moister environment.
2. Are you cooking hot n fast or low n slow?
3. You could inject with just some apple juice type mixture and forgo the phosphates.
4. If you are just pulling vs. pulled and slices?