That is utterly wrong, because damage reduction doesn't change with armor size. Reactive Armor works in a different way, if the damage is above the listed Impact Level is which is the same regardless of the armor size (only depends on ship size and maybe the armor tech level, I don't know for sure), only 20% of it will be taken by the armor. If that part is destroyed, the remaining 20% of the damage transfers to the next layer of armor in that direction, so it is not just aesthetic, after the damage, if above the impact level, is reduced by the reactive armor, it is soaked even further by the powered armor right behind it,which has a flat reduction, armor is directional as well so this design is effective and not just aesthetic.
Had it been one big Reactive Plate instead of multiple smaller ones, the damage would be reduced by reactive but still taken, and since the reactive plate wouldn't get destroyed, it would be a waste of HP since you wouldn't get the reduction from the powered armor beneath it. The key is to get the Reactive armor destroyed after dealing its reduction, transfer it to the powered armor which sucks it up even further. The armor is repaired faster with a Nanite Repair Unit which is connected to a Bulkhead because it covers all the other system.
I hope I've made you happy now.
I worked a lot on the design, it is perfectly optimized to take on anything its size and above in sufficient numbers. I play games that are limited to scale 600 anyway, but wouldn't have any problem making this larger.
It boasts the ability to keep firing even when the generator and one of the cores are down, I am considering giving the Mass Driver a Quantum Computer Core of its own so that together with its collector it can last alone with the quantum battery for about 20 minutes before the help comes, seeing as how this ship never travels without a repair ship, it basically will never be floating dead in space. It's either die or keep fighting.
Also, would be better if you could elaborate on the mentioned changes, I'm pretty sure this is the best possible armor layout for my tactics, and any more suggestions would be welcome. There are 6 more ships to accompany this one, so while I am aware it lacks ammo and isn't great at long range combat, there are many support weapons that go along with it. As a main battle ship, I am pretty proud of it and I don't think it could be improved much, but go ahead.