ill try the shroud first then if it doesnt work then i guess its turbulence. if it does work then the theory of jimmy may be a bit more accurate.
Hmmm you might be right on the airflow at the edges. I was playing with the fans the other day and it seems that the enermax blows in a more concentrated column compared to the yateloon which has a wider spread. I guess this does confirm one of the threads i read on the 65 fan test on the megahalems. I would still like to try the fan shroud thing but will need to look for a good enough material. (I guess the acts of "MacGyver" ing these stuff is part of the fun of building computers.)
@rolli and jimmy
Thanks for your ideas. if you have suggestions on the material to be used for the shroud please tell me. So far ill just test it out with a card and velcro hahahahah.