If you ever decide to change one thing, grinding closer to brew time is the biggest upgrade. If you are sticking with pre-ground, you can still keep it lively. Ignore the valve hype and focus on seal quality and portion size. Small opaque canisters or jars are best, one in use and the others frozen. Keep the working container in a cupboard, not on the counter near warm appliances. Close it promptly every time. You will notice the finish stays sweeter and less cardboardy.
