I always use yeast nutrient (aka Fermax), I don't know if it really helps at all. I am a White Labs guy, always liquid yeast and always make a 1L starter.
when using dry yeast should not need a starter.
If you are not adding the yeast nutrient to the wort just make sure to aerate your wort very well.
Primary: Hornpout Stout
Kegged: Monsta Pumpkin Mash, Saint Stephens' Eleven Ale, Pirate Strong Ale, Cascadian Dark Ale
The Secretion Brewery
Let's think it over and stop making sense