I'm not entirely sure about that. Taking into account the possible time on target... look at the distance between me and lonewarrior when I'm firing. The first two passes I was able to eat roughly 1 ring per capacitor charge even with him having 4 in sys. Later in the fight I made the mistake starting to fire from sometimes 2+ km away. The damage drop due to the distance killed my damage, not the beams itself. They're working fine if you know how to use them

Especially the FDL is made for shorter, hard hitting bursts rather than steady DPS due to its lacking SCBs. You need to overcome your targes SCB powered shield regeneration. If I try to eat all my targets SCBs I would be forced to run most of the time because I won't be able to tank long enough.