I was under the impression that feedback pulse ran off of weapon power. I'm almost certain that one of the dev posts or release notes specied this when it first came out.
So was that an error? Has it been changed? I'm not set up for feedback pulse at the moment and can't test it.
It was changed with the release of 1.2. the damage was nerfed and it moved from weapon power to Aux. This was done specifically because of crying of cruiser Captains that used auto fire on their beam array's. Instead of making them have to actually think they nerfed the crap out of the skill. Funny all they had to do was pay a little bit of attention and they could stop firing and total avoid it. Nope it had to be nerfed like most things to suite bad players.