I still believe that I would still think about richening your high end needle settings.
If you have a properly designed fuel filter, it would not be the cause of this. There are filters that don't work properly, but that is relatively rare.
You have the sullivan filter (I think I remember), and it should not be causing a problem. However, if you take it off, have no problems, then it was poorly manufactured... but if you still have the problem, then you know the filter was not the problem, and I would suggest tha you put it back in, unless you have a fuel tank that has a built-in filter, then there is not much reason to have another filter.