Deadrose, I'm glad this isn't the 40K universe because that post would have been enough for a 'ead bang.
Twin linking does not increase the shots you get, you shot twice as much with those suits than you should have. 3 suits each with plasma, twin linked or not, will get 3 shots at 24, and 6 shots at 12. That Space Marine player should have got pre heresy on your cheating ass.
How to kill lots of SMurfs; Focous your firepower on the squads that will do the most damage, you have the range to shoot at pretty much anything you can get LoS to. Do not try to wear them out wholesale, that'll get you shot up. A Squad of fully upgraded Firewarriors costs about as much as a full squad of Space Marines with no upgrades.