I can't remember the thread about this but I've seen others with similar problems with swapping out the actuator gasket and it still leaking. When I did mine I made sure I installed it with some liquid gasket maker + the new gasket and so far it has held up. I'd be very confident it isn't from the actuator its self and indeed the gasket. For what its worth I remember hearing that they updated the gasket design so maybe your continual issues are from the wrong part.
Edit:
Found the original thread in question