I had assumed that the 0.2 was a sniper/jugg etc debuff, so substituted that with 35% armour penetration I get from my cylinder. On the operation dummy with 35% armour penetration the 280 damage relics hit for 207. That formula says they should hit for 216, so either something isn't correct in the formula or the operation dummy has a different armour value. I should probably see if my sniper or jugg has enough comm's for one and test it at 20% to see.
Go a few pages up for the numbers that come up with various levels of armor pen, tested on my guardian in focus spec, 30% instead of merc/man do 35%, but will be close.
Was using the kinetic relic instead of energy, but I was testing damage number, not crit rate.