Thought I would give you an update on my little "experiment".
My broody hatched 6 out of 8 eggs.
The incubator also hatched 6 out of 8 eggs.
Hence, my experiment ended in a tie.
I told myself I would be happy if only 3 of the 16 hatched since they were shipped eggs. With 12 having actually hatched, I am elated!
I ended up grafting the incubator chicks to the broody tonight. When my normally very docile broody, heard me coming with peeping chicks under cover of night, she jumped out of the nest, looked all around her pen for the chicks, decided I was the one "hurting" them and came charging after me. I got her back on the nest and stuck the chicks under her the best I could and she tucked them the rest of the way under her. I checked on them periodically, and all seems to be going well.
This all reminded me of additional reasons why opting for the broody is nice... no need for a light/heat source, mama teaches them everything they need to know, and they are more easily, and quickly, integrated into the rest of the flock.
@OldMcDnld, were you able to break your remaining broody in the end?