I am doing similar although starting late as filling a couple ponds now. My ponds are either 0.25 acre or 0.10 acre. Broodstock density also lower with on average only to pairs per pond. By late October I expect at least a couple thousand bluegill pushing 2" per pond. Stocking this late increases odds only one cohort produced per pond thus reducing size variation at harvest. Need only one spawn per pond to make that happen.