please help me on constructing a best AC

[Goat]

Wraith is good for close combat while 93RL is good for heating and for stunning, I think. Maybe you should replace your 93RL with something else, like a machine gun or another quick-burst high heat weapon. Now about your internal parts, somehow you're using the Gull booster, try replacing it with something else like a Lotus or Fudoh generator, you'll need a very low-heat generator if you're using Gull so your AC wouldn't overheat that much, especially if you've got an OB core for your AC.