You may find that the optimum tune after walkback tuning may and probably will not have your BHs and FPs hitting the same POI. On every one of my Hoyts, I find that when my BHs pattern and fly the best, my FPs will be somewhere else and not flying nearly as well. The opposite also applies.

During the summer months when I am hunting foam, I tune for my FPs.
About 3-4 weeks before hunting season, I switch my bow over to BHs, and go through the whole tuning procedure again. Once the BHs are flying well, I shoot nothing but BHs until I am done hunting for the season.