My #1 problem with all coffee brewing with any process, but especially aeropress, is clogged filters limiting rate of water movement. If AeropressXL uses a bigger filter, I'm likely to try it to see if that improves brewing.

Typically the regular aeropress filter clogs badly enough when pressing (almost regardless of grind size or sifting fines) that it slows to a trickle. Press harder and the coffee leaks out the side of the filter. It's frustrating.