Yeah,wanted to say the same.
Phys legs for even more health.But instead of adding a NightFall I think you should swap a heat engine to a Cooling Mass Booster.You’ll save weight and have more cooling (in this case,you’ll need more cooling than max heat,for you’ll still have 450+ when maxed)
However,you have a lot of heat but not so much energy.
That’s why I advice you change the modules instead of the weapons.Adding a NightFall would mean that your build would only have 1 energy-free weapon, instead 2 with the Annihilation.Like this,you’d keep a semi energy-free build,that would be more efficient with that amount of energy/regen.
Trust me,it’ll be better for your phys like this.You’ll still counter heat as a physical,you’ll have more chances against energy builds (Anni drains res a lot,so after you can use Mercy;even better if you are in range to use both your side weapons).
Other than that,it’s pretty damn good.