This is a double sided razor blade.. 2 parts to this if you want large sunfish.
#1, If you start with 1-3" BG, PSS etc, you are more apt to know they are not already stunted.
#2, If you start with large sunfish you don't know the age and they may never achieve the desired size.
Now the tuff part....what do you plan to use for a Predator species to control the sunfish to keep them from overpopulating and stunting? to grow giants, You don't want a lot of competition for the same forage.
Another option is to stock male only of sunfish species, this will probably be the best bet for growing large sunfish and not having a stunted year class starting the 3rd year.
1 female can ruin the entire plan in a couple of years, you have to be sure of what you are stocking.