I still don't like the idea you can "angle" your screens in time to deflect a light-speed attack. Sure, you can angle them towards the enemy, but that should be a straight-foward move. We already have the sensor operator doing all kinds of stuff. Screens should just work, like shields. Maybe the idea should be a good screen operator can get them to deflect a little more damage, but overall I think they should just be "on" or "off". And no software should be needed. And no optimizing (unless that's somehow part of the screen operator roll).
If we go with having an operator who has a chance of tinkering with things, there should be a potential risk to doing so. Try and tinker too much and you can be successful, but then again...oops, instead of evading 50% of the damage by default, you only deflect 25%.
Since these aren't magical shields, I'm okay with them allowing a certain amount of damage in. hell, we could just make them truly flicker-like at all times and while they are operational they can blunt the attack of some of the more powerful weapons. Which makes the average laser or rail gun pretty effective. And still useful.