I just received 2 packs of WLP500 from MoreBeer. both were manufactured 12/19/18 I am brewing a Tripel O.G. 1078, 5.5 gallons. I prefer a 1.25 pitch rate as I'm doing a series of Tripels and pitch rate is a part of that. The calculators on viability go from 31% to .4% Ironically MoreBeer's...