about having problems with front exhaust, i have an antec server case, which has a grill the entire way down the front of the fans, so the airflow is sufficent there.
i do not have a buildup of pressure in the computer as there is many gaps in the tower that any pressure differance will escape through.
my cpu fan is running at max rpm, and so are all my casefans.
i have Arctic Alumina Premium Ceramic Polysynthetic Thermal Compund. i have also used Arctic Silver 5 with little differance in temps.
as i said before, ill try reversing the flow of the fans and see what that does