@Tartiflette
If there is a weapon tag that enforces missile PD only, that could work. Then other stats could be left be and OP could maybe get knocked up a bit. Then you have an expensive solution to missile defense, assuming ALL you want out of that slot is premium missile defense. As it stands right now, the repeater beams can be used as dual-purpose weapons in frigate-frigate combat as it's highly unlikely a frigate will spit out enough missiles to overwhelm the repeaters, providing a viable anti-ship weapon that outranges most frigates' guns but is really heavy on the flux for frigates to use for any length of time. Then they get more unwieldy as you get into bigger fights with higher missile volumes and the fact that they probably still outrange your actual guns forcing you into fights with flux already built up unless you actively toggle them as and when, instead of simply leaving them autofiring all the time. In capital ship fights, the fact that their range only just lags behind weapons like the HAG, the Mk IX or the Mjolnir while outranging the Autopulse means they start firing almost the same time your main guns do and beams do little to ships of this size unless you really go overboard (see beam Paragon or Templar Longinus) and the ones that can't even withstand repeater beams are likely also the ones that aren't suited to combat anyway so at this point, they're only depleting their charges unnecessarily and driving your flux up.
We shouldn't highjack Blackrock thread so I'll continue here. I'm thinking changing it completely again, probably back to a vibrating beam but one that works this time. There is already four PD weapons in Scy : Auto Nailer, Small Flak, Hacking comlink and Burst Nailer. Adding the Burst repeater Beam as a PD was a mistake as the premium super PD solution is supposed to be the Minigun with the PD AI hullmod. The idea was a weapon that is good against small swarms of missiles like those damned Hornets but weak against torpedoes or continuous incoming threats. The problem is that I somewhat changed the Autonailer to that behavior too, and the range is way too long compared to any other PD capable weapon for the same cost. As you said, it's only drawback is the flux that raise sharply on small ships.
The Vibrating beam was a terrible weapon because it had to be locked when firing, had a hard time killing anything with the slightest armor and was useless as PD. Maybe the same weapon with a much higher flux efficiency and damage could be ok, but the best would be to find a way to make it fire continuously, and that's what I'll try. I might buff the Slasher beam too for the same reason.