dude you only had nirvs ?
you know you could simply go attack him in counter from any pr.
However
rubies suck against missile and enery attacks - try juggs
amethysts suck for virtually any attack but i think energy - something with kinetic weapons there possibly nirvs, they`ve higher hull or f swords if you don`t give a toss
and tourmaline suck against missile and energy so somehting like tyr there
pretty much if you`d stacked wtih more than one stack of nirvs and had the right ship you`d have pooed all over him in defence, do read the manual its got all the ships mods, weaponry and shields and try and learn them it will help you actually kill things.