Points variance for tiers. Killing a lower tier is less points. Killing a higher tier is more points.
T2 in Veteran are worth 2 points.
T3 3 points.
T4 4 points.
So at the very least the higher tier your team the more risk you take. Plus it should help curtail the farming of lower tiers in some matches. You could make it even more drastic than that if you want.
You could get more complex if you like it tie it directly to your own tier. Example being...
If you're own ship is T2... you get a full 4 pts for whatever you shoot down.
If you're T3... you get 3 pts for T2 and 4 for T4.
If you're T4... you get 2 pts for T2 and 3 for T3 and 4 for T4.
At least in that way you are properly rewarding each action. A T4 beating on a T2 isn't a feat at all. Yet a T2 getting a T4 is.
Just an idea. I know it doesn't fix many of the other issues but it may make people feel less bad for getting wrecked by higher tiers knowing it's costing the team less. I wouldn't doubt it if someone had come up with this idea before... so apologies in advance.