I recently (2/16) started a Vinefera Noble Cabernet Sauvignon and a VF Zinfandel. I followed the kit directions. The initial S.G. for the Cab was 1.082. The initial S.G. for the Zin was 1.084. This seems low to me. My hydrometer is properly calibrated and the initial temp. for both was 74*. Are these readings low? If so, how to correct?