Yes post too quickly how about this; you will end up with GSF look alikes that grow to sizes that most pondowners would not be proud of. Aaron sounds like you have done your research. I guess question remains why bother with killing off sunfish when you can stock others that will out compete.
How about stock some native bg and some HBG of the same size and track their intial growth and top end growth??? We would love to see the results.