Nerfs Iber, Kush and Rome team bonuses all from 20% to 10%.
For Iberians it is because the cheaper skirmishers allow for a very strong boom, a very strong cavalry rush and also gives a much stronger late game due to being able to spam units more easily, and also be cost efficient whilst taking bad fights.
For Romans it is a similar story to the Iberians. Units being created faster allows for a stronger boom, makes defending rushes easier due to being able to get defenders out faster and in late game you can reinforce armies quicker.
For Kushites it is because I plan to reduce elephant base cost slightly (to 225F+M) and with a 10% reduction that ends up being the same cost as 250 with 20% reduction. Elephants with Kush teambonus already feel very strong and by leaving the teambonus unchanged they would end up a bit too strong.