What's wrong is simply the number of people per field. There's no reason to try to force 75 people per field. It's obvious that you'll get this unfairness. Limit it to 35-40 per field and everything is solved since even if you are in the bottom of a field once very likely the next time you are at the top of the following one due to people that joins or not joins and due to how fast you'll be in growing up in power in comparison with other players