The first year I did everything your doing, base weight, weekly weigh ins, keeping track of weight loss in a note book. The second year I realized I really was only doing that because I couldn’t candle them.
So I didn’t do any of it, I knew I wasn’t going to give up on any of them until the bitter end anyway and had the same hatch rate.
You will notice one end higher than the other as the air sac enlarges & the chicks get bigger.
When they start wobbling, I start playing the Emu sounds from YouTube and just set my phone inside the incubator for them. It definitely increases their activity & whistling!
I let them hatch right in the incubator & use a packnplay that I picked up from a yard sale site for $20.
I will look for pictures.