Cyclometric you are trying to change the way heat works. The heat flow in your case is all a mess. Heat goes up, heat also follows cool air in any direction. You got to remember it is winter and what this is doing, is working for you now, but it will not be the same in other seasons. Your front intake and exhaust are way to close. Your GFX has a air handler that blows air out the rear of your case, only to get sucked back into the coil of your H50.
I willing to bet that more than half the people that have the H50 in intake are going to come back later on in the year asking why the temperature of the H50 is getting so high. Its because they have it set up wrong. You got to remember the H50 came out in winter and a very cold winter on top of that. What is working for you now (intake) will not be the same in other seasons.
Try following the laws of heat it will work for you in any season.
O yea + REP for the links...