Originally Posted by DurangoMatt
What do I need to do differently next time?
Make a yeast starter.
100g of light DME to 1000 ml water is ~1.040 and is what I always do. Add a little yeast nutrient (either FAN, or yeast energizer). This will ensure you have enough yeast to do the job without them getting stressed out (which is when they produce off flavors.)