If you feel like losing Arms too fast, then focus on Torso.Weapons like this! Alternative with a more common XL280: Testrun: Blagg
I saw some person running this build, and they did not take advantage of the weapon differences you have here(hit-scan vs ballistic's). I do think this build is quite good, As you could run a decent standard engine in this mech. 5-5 stars.
I have come up with this build aswell and it is rocking! For some reason, I am more often close to 5-600 damage in a match then not. If I manage to hang onto the later stages and not get killed early on, far too easy when you have this engine to work with.