LOL- I lived in Lex for 14 yrs, now I live very close to Drumlin. I worked at Wilson Farms until cancer.
Anyway, as you mentioned the parent can give an indication, as neither Blueberry or Blue Mystic seem to eat much. I usually go slow, but I'd hate to not get full potential by under-feeding those that like it.
I have several varieties in flower and veg- Jock H, AK48, Afghan Kush, Pot of Gold, Bubblicious, Ice, Blue Mystic, G13/Haze. (PS- I use Hempy Buckets, all perlite.)