I actually use OEM paper filters :blink:
Mahle and UFI are OEM fitments for my car and I have to take it on trust that BMW knows what it's doing as there's no other alternative for me. The factory intake system draws air from outside the engine bay so no point in me fitting cones; plus I don't want the noise either!!
I suppose if the oiled cotton or foam filters were much better in terms of overall performance then we'd be seeing them in high performance cars.
I'm not sure what to suggest as an alternative really. Maybe see if either Mahle UFI makes a filter which fits the airbox in your car? Not that we know if they're inherently superior to the OEM ones you are using.
I assume that OEM filters vary in terms of performance and quality too.