Tezzereth, on 10 July 2016 - 12:24 PM, said:
Uh, no.
Pretty sure optimal range is just that... range that you can do max damage, and damage fall off from that number until max range is hit.
Yes, this is correct. LBX-10 also has 3x range for max damage, similar to the Gauss rifle I believe. That said, you will be spreading the damage around and missing with some of the pellets. With the falloff of an AC20 taken into consideration, you are still doing more pinpoint damage to a single component with the AC20 than the LBX even out to around 450m.
As far as OP's build is concerned, trying to add in long ranged weapon in such a low mount to remain relevant on maps like Polar takes more away from the strengths of the mech than it does to cover up the weaknesses. You really need to focus on learning paths to take to stay in cover, avoiding peeking at enemies. Twist when moving through open areas until you are in range. Be patient, every game will eventually close to your strong area, even if you aren't contributing much for the first 2-3 minutes. Once it gets down to brawl time, and if you are pretty fresh, you will find yourself dropping enemy mechs with every few salvos.
I run AC20, 4x SRM6s, and two ML in the torso mounts. I ignore the arm mounts and shave a little bit of armor off the arms and legs as well. Most opponents will be gunning for your LT on the S variant, and the RT on the D-DC, so you might end up losing that arm armor anyway. Try to pick positions which force the enemy to come to you. The basement on HPG Manifold is a great example. Get a couple teammates to go with you, and you'll wreck anyone who comes inside.
For weapon modules, I'd suggest running cooldowns for both AC20 and Srm6. Their cooldown timers already sync, so using just one cooldown module actually desync them. Range for the 20 is acceptable for a single module as well, but range on the SRMs is pointless since they spread so much anyway.
When you need a 3rd variant, I'd suggest the -D or the -RS. The -D has resistance to critical hits, which can keep your equipment alive longer, and the RS has a good amount of energy mounts in the arms for larger lasers if you like. LPLs paired with an AC10, ignoring the 2 missile slots, is an OK build but not spectacular.