Flo was never too potent but with some moab/ mapmkp she yielded like a superstar.
My grand daddy experience is specifically grand daddy x grape ape and was super grapes with that stacked node structure gdp is famous for. Taste with the gdga was more grape juice than the sweet hashish flavor of the flo.
As for the Blackberry Kush Homebrew420, really I'm quite surprised you'd put it into the same category.
Do you think this is the tried and true orgnkid blackberry cut??
To me her frost factor is glands on glands straight dripping, depth of flavor is limitless depending on style of growing, and her flavor profile actually does carry over into the concentrates made from her.
The only semblance I see between BBK, Flo, and GDP besides pretty colors and potentially "fruity" scent, is overall lack of medical potency. After time even the super dank BBK succumbs to strain stagnation.
Sorry this doesn't help narrow down the flo bberry phenos but hopefully it's insight enough into the genetic variables within each strains makeup.