[Val]

That's a good question... B5 weapon/shield tech wasn't too much a priority in the show, it seemed like new weapons were being developed throughout, but not much in the way of shield/armor. I would say it should keep pace with weapons tech in percentages, though I think it should be very expensive to research as you go up levels, maybe even require the person to research "Advanced Armor" tech before freeing up the next level of each armor group. Also, the armor/shields should plateau at some point before weapons do - in effect this will allow the weapons of a particular 'age' to outstrip armor from the same tech 'age' (Young v. Middle v. Old v. Ancient).