So, after "main"ing this mech since it dropped, I have the following to say:
HOLY SHIT BALLS THIS THING IS AMAZING!!
Also, I tried the UAC10, 2UAC5, 4MPL thing for a day (12-ish drops) and it was lackluster. Too many jams. The constant stream of dakka is neat, but spreads too much when the target is rolling damage. Please remember that I am mostly a solo PUG player (more than 85%).
The key to this build is the weapon groups, as is often the case with mixed builds. I run with Group 1 as Dakka, Group 2 as All Lazors, Group 3 as Left Arm, Group 4 as Right Arm, and Group 5 as LPL (even though they were nerfed, but sometimes you want them at 600 and the heat is not worth it for the ERMLs). I retract my comment about the ammo drop for TarComp. Not worth it. Sometimes you just have to carry harder. Group 1 is basically heat neutral when jamming happens. Each arm is heat neutral after the LPL hits cooldown.
The modules (RIP, I will miss you guys) that I run are Radar Derp, Seismic, UAC10 Cooldown and erML Range. I chose the erML range over the LPL Cooldown because it is hot enough already and I don't need help overheating it. Also the range is just nice in general for those 400m pokes.
In summary, I love this mech. It has done nothing but amazing things. I haven't done this well in a mech since the KDK-3 pre-nerf. Or for that matter, the Oxide pre-rescale. I am not a comp player, so I end up with 3-6 KMDDs and 2-4 kills per match. Often the KMDDs is more than double the kills. My mentality on this is "I set them up, you knock them down". My KDR is 1.67 in 8.5 hours (logged game time). Overall, my KDR is lower than this. 33.5k damage in 71 matches. But like I said, I am not a comp player.
Enjoy! and Cheers!