Many people seem to be having problems with interdictions. Some of these problems appear network related (stuttering, vector jumping), can't help with that. But others have difficulty with the vector moving too fast. I just noticed I do something counter-intuitive in these situations, and maybe not everyone knows about it. Generally speaking, when flying a agile SC-ship (Eagle, Vulture, DBS, FGS etc) all you have to is is simultaneously roll and pitch towards the vector. In less agile ships (eg. Asp) I sometimes find I am flying in circles after the Vector without getting any closer. For example, the vector is above and to the right of me, and rolling and pitching towards it doesn't work. In these cases I find very briefly pitching away (down, in this case) from the vector works very well. You kind of 'push' the vector to the center and a bit further above you, after which pitching straight up gets you back on the vector.