i think 2-3 by the same hand but once they get made and spread and others futher the project things can and usualy do go in a diffrent direction, and if the same hand works the GENERATION the strain gets moved futher along the same path and the PHENOS begin to be less and less as the breeder gets closer and closer to an IBL......
i dont think ive made an F3 of anything from my own hand except for may be the PLATINUM DOJO, i usualy dont take them very far before i start other projects...as you know i have so many strains so i try to make good HYBRIDS then push forward to other genetics....
but ya if done by the same hand id say f2-3 will give ya the best phenos..
peace brother:)