I have a LG that regulates dead on. I bought a 2nd one last year at TSC and it would NOT regulate correctly. I took it back for an exchange and it (like my first one) is spot on! My guess is that they may have some quality control issues at LG.
The eggs will probably be fertile for about 3 weeks after taking the rooster away. If she ain't broody then she won't sit. It doesn't matter that you touched it.