Well, I do see a few problems and inefficiencies.
You've got a Beagle Active Probe and ECM in the same 'mech. Those systems don't play well together, such that the Beagle won't perform its anti-ECM function while your own ECM is set to to Disrupt enemy sensors (the default, defensive setting.)
Trading in that 4th RAC for the SNPPC (and AMS) creates a ballistic mismatch in your weapons loadout. I don't mean the hardpoint types; the firing pattern and projectile speed of the RAC and SNPPC do not support each other well. The RACs are "staring" weapons, while the SNPPC is a high-impact, slow-firing gun. Their projectile ranges are similar, but not identical, which is going to tend to spread your PPC round strike away from where your RACs are hitting, offsetting the value of the PPC's pinpoint damage. The dramatically different optimal ranges of the two weapon systems is also going to mean that, often, you're either not getting the full damage out of that Snub or else you're fighting at closer range than your RAC convergence can easily handle - any of these three points can be a minor problem, but together they're enough to raise a yellow flag, at least.
So! What I would do to this build - assuming that you're going this route to play around with Stealth Armor because of the quirk - is rework it
Thusly. Ditch the AMS to avoid giving away your (Stealth Armored) position, upgun the engine a bit, and fill the rest with heat sinks. You still have a probably excessive 2000 damage worth of RAC ammo, you can move a bit faster to make better use of that stealth, and your heat efficiency is better for when the fighting is heavy.
Stealth Armor is a bit of a pickle on Assaults, though. You're a huge, slow 'mech no matter what you do, so it's challenging to make better use of the extra stealth as opposed to the 2-ish tons of armor you save with Ferro-Fibrous. So, I wish you luck! If you decide to try something else with the build, however, you can always
Abuse the HSL Quirk instead of going Stealth Armor. =]
PS: Also, I fixed your back armor; you'll find that you get more out of shifting nearly all your armor forward - it's why those GrimMechs builds have like 3 rear armor points on the builds.
Edited by Void Angel, 02 July 2023 - 02:53 PM.