To be fair , and if you do the sums , the advantages of reactive surfaces over military grade are only positive for absolute and kinetic , so for nearly half a billion , you actually take roughly 25% reduction in thermal resistance, , which given the nature of PVE weaponry that you will encounter , is entirely counterproductive and an unecessary expense. Compare the two builds on coriolis and you will see.Ok, why would you do Lightweight mods on Reactive Composite Armor? That defeats it's entire purpose.
If you buy Reactive Composite Armor the only mod that goes on it is Heavy Duty G5, with the Deep Plating experimental. Anything else is a waste.