Because attacker love ddosing litecoinpool.org as primary target, my suggestion is to raise the fee a bit to 6.5% and use the 1.5% fee to get a better server, if possible or as emergency funds if something bad happened (mining pool get hacked).
With 6.5% fee, maybe some people will move to other mining server or create their own.
You can reduce the fee back to normal again after things back to normal - more mining pool created, or some people leave to other server.
There are a lot of CPU miners at litecoinpool.org (which makes sense, since most of the other pools have moved to a fixed lower target), so I don't feel like increasing the fee further.
But! There are already two other public PPS pools out there, and both have lower fees than this one. They are notroll.in (4.8% fee) and Xurious's (3% fee). Both seem to work well and are run by serious and competent people, so I invite all GPU miners to give them a try.