I would run more ammo, and more JJ, just for taking out 1 DHS and the BAP. You can still snipe, and be just as cool as before. But, I don't think this is a great use of this chassis ability. so, pray your arms don't get blown off. 3-5 for the OP build.
Possible but I found BAP and the heatsink a lot more useful then additinal ammo. This mech is quite fast and so I change tagets often enough take advantage of fast target info - Higher sensor range and closerange ECM counter guarantee good LRM support if availiable. Try the build it works astonishingly well.
Single MG seems useless. A troll. Very little damage unless crits are exposed, and, even then, very little addition firepower. Personally, I'd drop the MG and a heat sink, use the 1/2T you already have leftover to add a SRM4 and some ammo. It's your build, though. If you like how it's working, rock on! Chatt.