My last 2 brews I've used a yeast starter. I used it on a Chocolate Milk Stout and an Irish Red Ale. During the 1st fermentation of the chocolate milk stout, the cap fell at almost 2 weeks (almost the same time the cap fell on my hefeweizen w/out a yeast starter). During the 1st fermentation of my Irish Red Ale, the cap fell in like 5 days. Is this normal?