just made 10 gallons of an IPA, 1.060 , added yeast energizer last 15min. Aerated by sifting trub through a strainer and then shaken. It is 17hrs later and no activity. I am a little worried, because all I usually use are US-05 and S-04 (which never fail). Should I be? Am I just worrying too much? Thanks for the help.