The airflow adjustment for the KFL+ is on the bottom though right next to the fill screw.That is a no sell for me with that,i like to be able to adjust the airflow on the fly like my R91 does.I think that was a seriously bad move placing it there.
No,i have not read any problems with leaking out the fill port on the KFL's,that's not to say that some have not had leaking issues,i have not heard any that's all.