@RahXeph0n
You have great selections of hardwares, however u miss looked all the factors that u pointed in ur previous post.

Just forget about SLI, because there's impossible for the second card to be installed properly with sata connector at that location. Which is why I prefer mobo with sata connector at the edge of the mobo and point straight out ...

In term of cable management wise, u did the best you could. So bravo and be proud with it ..

For the casing wise, I think it's not the problem with the case entirely, because the type of fan and cooler used affect the thermal performance ..

Secondly, the opening for the case fan just too tight, which mean reduced airflow could be brought into the case.

Thirdly, try to avoid cooler that blow toward the mobo coz if the exhaust fan is not strong enough to pull the heat out, the case would just trapped lots of heat.

Forth, get a third party cooler to help to facilitate heat transfer for both your CPU and GPU ...

Fifth, just mod the opening for the intake fans and u should get a better result.