yup,the IFX has been travelled so far.
anyway,most of the TR hsf has no flat base,this is due to the heat pipe i think,but i no mind,cause no matter what cooler i get,i'll lap the base until grid 2000 to make sure it has perfect contact.
but even they are not flat,their performance is still good.i got my new TRUE from moderno today,tomolo i'll receive it,maybe switch to IFX-14 again,i sold my IFX-14 cause it cant fit my maximus last time,the pin fin (chipset cooler) blocked it locking mechanism
as for the fan,if u have exhaust fan at the back of ur casing,u put the fan at front or at centre also doesnt matter,i tested,but with normal 12cm fan la,high profile fan might be have the temp drop??
but i do strongly suggest u to use both the same fan to get equal air flow of push and pull.