From day one with new yeast, I overbuilt a starter, at high krausen I collected one pint in a sanitized mason jar and stored it in the fridge, and used the starter. The day before each batch I remove the sample from fridge, let it warm up, pitch it in 1.040 starter, being sure to make a pint too much, and repeat the process. I've been at it now for over a year, 30-40 batches. Any advantage to refreshing the strain?