My Sportsman dried the chicks to the membrane if they don't get out really quick. I found running my humidity between 68-72% helps a lot. I have had drownings go up by 1-2% though. Better than helping half the chicks out of their shrink wrapping. I use a q-tip and moisten the membrane stuck to them, crack off as much of the shell as I can and as long as it looks blood vessel free, I start removing the membrane. What I hate is when the membrane and mucus won't come off. I had 2 that were matted for days and one's butt was matted over and couldn't go potty. I am so glad I caught that in time! I keep an eye out for it now (like today's shrink wrapped baby couldn't poo and I had to clear the path).
As for the LGs - I got rid of mine in 4 months. I got a Hovabator 1602 and used it for a year. Temps would vary with ambient temps - to be expected - and would get a bit weird when the chicks were in lock down. I would check the temps 3-5x a day. Overall, it was a good incubator. It just sits here, unused... I should probably sell it...