Do the teachers ever volunteer bad things that happened? One day at pickup a teacher mentioned that DS had had a rough afternoon because they were swamped (still within ratio, but usually they have an extra teacher) and all the kids decided to be cranky at the same time, so it was just impossible to pick them all up at once when they cried. It was reassuring that she volunteered that, because it gave me more confidence that when she says he's had a good day, it's not a lie.
Also, any care situation is going to have some aspects you would change. You need to be honest with yourself about what they are, what the potential impacts are (is this a safety issue or an "ideal learning environment" issue or a convenience issue?), and what the alternatives are.
When you say forms are incomplete, what kind of omissions? I don't need to be told what activities they did, but I do want to know what DS ate and when he slept. If they're writing down "drank whole bottle at 9, 12, 3" but one of the three bottles you sent is still full, then I would be worried.