Birds are still flocked up in to their winter groups, focused on food sources for good reason. You’re either going to have them all, or none.
I’ve noticed this too. Enormous groups when I find them, like they are in the winter behavior. Luckily I know where the main flock is, and I have permission to hunt next week during season B. Just have to get one close enough which is almost always the problem.
Season A is always a gamble for me with the weather. Its nice to get first crack at it when its finally legal but it seems the weather rarely cooperates. For this reason I usually select season B or season C.