your current torso is ZARKARES. Used to be a decent torso but the game buffed others rendering the torso not that good for the long run. You can stop to max and work in the side with WINDIGO.
Windigo and NAGA are the same in principle but in some ways WINDIGO have a tiny edge. Sure, weight a bit more.
Your current torso, then you can use it as temp torso without max as your second mech build if no other torsos available just to make a second.
WINDIGO will take you to top with the right modules and will be more like based on R3.
Max the modules. Your mech cooling and regeneration is very bad and that kill you using your own weapons and the opponent kill you too fast. Keep the torso till you can equal on level the WINDIGO in the sideline because the torso help regenerate, cool and provide heat and energy cap.
Enhance arena shop items with 5 wins every day to collect the silver coins and enhance your account support.