They need to fix the gun mechanics.
At the moment, damage consistancy is linked to armour penetration (in a positive way).
Armour penetration for HE and AP shells are related; So if you have weak HE penetrating shells, AP shells can get bounced at low angles; leading to the big issues with 25 degree guns; naturally low angled guns are meant to have low armour penetration, but SDE gave massive buff's in other areas (i think it was muzzle velocity) so that the AP would work. Unfortunately, it means the 25 degree guns don't get a slight damage penalty for hitting belt, and it means that they smash through armour when hitting deck anyway.
Low angled guns having range jumps also, which needs fixing.
Probably a few other issues, Richard is the man who knows NF guns at the moment.