Had someone use feedback pulse in T4 as a klingon and I started getting pinged for 1400 per pulse.... sooooo you can do some really lame stuff as klingons in T4 as well. Im guessing they probably stacked it with scanner sweep though, as my combat log also showed them using feedback III for only 600ish as well.
T4 is where things start getting silly, but its for pretty much like that for every ship type, my raptor in OB was hitting for 10k with quantums (non-crit) because of scanner sweep as well. And that transferred to HYTs as well, shields dropped and pretty much anything would die in 3-5 seconds.
Scaling is wierd in this game, probably needs toning down across the board, scanner sweep starts at 20% debuff and if you max it, becomes 80%+
AP-alpha is similiar, but is broken for klingons from what I hear. (scales with fed escort skills)
This also applies to alot of shield and hull refill skills xP