1. Max one tier between you and max tier in match (2 tiers are often not fun. You are just cannon fodder for the high tiers)
2. Max one Carrier per match (Not fun when 4 torpedo planes all dump their load from all directions - Nowhere to hide)
Those are the only two things annoying me right now.
I have one suggestions:
1. Hard weather with big waves. Rocking the ship, so shooting/aiming is a bit harder.