I don't like ERLL personally. Duration is too long. LPL/MPL also have different engagement ranges, meaning you'll overheat less easily when bad with heat management. In case of the ERLL I'd mount at least 1 extra DHS instead of even more ammo, you already have 45 full salvo's with just 900 ammo and IMO 30 fulls (even if you stagger them) is a minimum for LRM5 spam.
Agree with the duration, I use it to poke so I can get more lrm time when they move away or twist instead of trying to shoot me.