This is a high mobility AC20 platform. I respectfully disagree with slow AC20 builds on the SHD. You need the mobility to put AC20 rounds where they are needed. Hence the name "Kill Stealer". It's essentially a close range assassin. You only have 4 tons of ammo, so don't charge in at the first sight of the enemy. Use your MLas to poke around for weak spots, cycle through targets to see who has open areas. Your prime targets are open legs, side and rear torsos and critical weapon areas, i.e. right torso on an Atlas. A critical hit from an AC20 will tear through most unarmored parts. Use your entire right torso to shield If you enjoy going Leroy and plastering enemy with fire all over, this is not the build for you
You have 16 empty slots, you can upgrade the armor and add another ton of ammo and few points of armor (or anything else you want, like a second ML). I agree with you about the slow AC/20 builds. But I don't know if your build is better than the classic "no-40" Blackjack, that also have AC/20, jump jets and similar speed. And have a much more mobile autocanon.