I've been trying to counter carriers with LF for God knows how long - always unsuccessfully.  I finally had a success.  I was vasari, my TEC enemy was predictably spamming carriers.  So I started spamming skirmishers in what I thought would be yet another utterly doomed attempt.

It took me 40-something skirmishers to counter his 15 TEC carriers - roughly a 3 to 1 ratio.  It worked - I killed all of them.  A few things:

1) Just as when trying to counter the enemy with flak, it takes a LONG time and a dedicated committment to churn out that many LF.  Requires several frig factories churning them out continuously.  Don't know if it's my imagination or not, as I've never timed it before, but it certainly does seem to me that the enemy can turn out a carrier quicker than you can turn out 2 flak, or 3 LF.  I always had to play "catch up" to how many carriers he was able to field.

2) I didn't add up resources spent, but I may have in fact spent more than him.

3) He didn't micro his carriers very well.  If he had, I doubt the counter would have worked.

4) If he had mixed in LRM, I doubt I would have stood a chance.

Oh, I got the interference ability too, and saw it working, but I have no idea how much good it did.