I use energizer and nutrient in every must, mead or country wines, just to make sure of a healthy fermentation. Have not used ghost hulls but have read they are good for ferment. I have switched from using the urea based nutrients to DAP.
I tend to use a mixture of DAP and Fermaid-K (which is a nutrient mix). I definitely use them in my mead and I have started rehydrating with GO-Ferm as well. Does it make a difference? I seem to have quicker and stronger ferments when using all of the above. I am not 100% sold on the Go-Ferm but I really like the DAP and Fermaid.