Changed direction on the 4+4 fans on the right side back and it did indeed help. It actually looks like I can't get negative pressure even with all the fans in the back at full speed. I've ordered 4 80mm fans to put on the top to see if that can help getting the air out.
Fans out, back is 12 fans in a pull/push configuration.
Fans in through the radiator, front is 18 fans in a pull/push configuration.
The radiator is a Mo-Ra 3 Pro (yeah, I mounted it in the front of the cabinet, got MountainMods to make a special front for me hehe).
With the front fans at 400rpm and the back fans at 1000rpm the water temp is about 1.4C above Room temp, and the cabinet temp is about 3.8C above the room temp.
With the front fans at 400rpm and the back fans at max (almost 2000rpm) the water temp is about 0.1C above room temp, and the cabinet temp is about 1.6C above the room temp, and even with these settings there's a healthy positive pressure inside).
The cooling of the radiator is about -2.8C. The only thing heating the water seems to be the Aquaero where the water rises about 2.2C (heavy use of 2 of the amps, but even so, they are hardly above 29C, half a degree higher than the 2 amps used for the radiator fans). The CPU is 0.2C and the GPU 0.4C. I removed the water blocks on the X99 and Mosfets, the MB looks better without them heheh.
The sensors was calibrated by leaving the cabinet open (sides and top removed) and letting it stand in a closed room for about 12 hours. I then used a normal termometer as basis, since the real temperature isn't as significant as the difference in the tempratures.
The room temp is meassure about 15cm below the desk and 15cm in front of the top part of the Cabinet, a little over where the radiator starts. The probe is placed in foam (to keep it from touching the sides) inside a small tube previously used for a refrigerator termomether. This should keep the sensor from getting disturbed by wind and also from fluctuating too fast.
When I get the new fans and have everything set up to keep the delta temps at 1.5C for both cabinet and water I'll make a video of the Aquasuite with all the meassurments while doing a stress test.