you are perfect size for origins, you can hit on the haunting with 7.5m pots but towards your last 10 hits you will need 12m atk pots. FO pays well if you get the item phase to yourself (162 gems) and you will make a 1b bonus with full unload. If your clan can do that every hour then you will do fine. Origins will pay you very well also especially if getting in on the item phase. There is a good pattern anyone should realize in EB's any one of these that has an item phase, make sure you get in on that item phase bc they pay well.
No man's land is the most slept on eb. If you are active from the start, you can make close if not over 10 BIL. I know a guy who made 16 BIL plus all you usually need is the 1 mil and 2.5 mil pots together to hit. The per hit gross is better than origins.