I don't want to cull these birds as they seem super healthy otherwise. They hatched a few days ago, and I noticed one always chirping and then saw his eye was crusted over with some brown/reddish crust. Someone told me to take a damp Qtip and moisten it and rub and it came off. Now he is running...
You can give ice cubes in their waterer, mine like that. I think frozen water bottles are fine too. The heat is taxing on them and can stop them from laying. I'm in Columbia getting the same heat wave you are and I only got one egg today.
Sounds like they're getting splay legged? They can get splay legged even on paper towels...try the non skid material like used in pantries.
You also need a thermometer underneath your heat lamp.
For jumbos I'd expect 12 grams minimum, 13-15s normal. For the breeders, they should be near a pound at full size, maybe a little less. This is for jumbo browns from a good line.
I'm sure you can find great eggs, locally or shipped to you if you don't want to wait. Make sure to ask how much the eggs weigh in grams, and how big their breeders are on average if not buying from someone reputable.
Your typical Craigslist ad will always say "jumbo browns" even though they might weigh 9 oz as adults. There is no official standard and it probably makes them sell more eggs.
JMF has great jumbo browns. I personally avoided the A&Ms but he has the biggest available. The white birds can be...
It depends on the kind of quail. Most recommend 1 square foot per bird, so 6 coturnix quail. If it's a grow out pen for butchering, you could probably add some more.