I am making an American lager for the first time. I am using 2 packs of WLP840. Made a 1600 starter and decanted. Expiration date was 3/31, so close to the end of life? Anyway, after a week of fermenting at 52, it’s dropped from 1.056 to 1.040. Is this slower than usual? I’m worried the yeast was too old even with the starter? I know it takes more time than an ale, but seems like it’s started to slow. No more airlock action, not that it matters.