Yes this is the same issue I am having with the Antec 900 v1 case.. Its a nice case and all but god I have the worlds most unmodular 800mm length cable psu in it and lolol.. i did the same as you, just tucked the excess into the bottom hdd tray XD
I eventually relayed the wires again (3rd time) and this time i bothered to run them behind the gpu to help with airflow or lack of.
If I could buy my mid tower case over again, I would have gone with the Lian Li case that looks almost like the antec with better airflow (imo even if 1 less front intake fan) because it has cable management holes which is > any fan if no airflow.
Not to mention its got a sexy black interior as opposed to my fugly metal gray lol.. btw both leak light, antec has less airflow, lian li has cheaper made but heavier case, antec has poor quality fans. I would just replace the top exhaust fan but then I would have to dismantle pretty much the entire top of the case just to do so lol..
Where was I... Oh yeah antec 900v1... No pictures of mine will be going up yet 😛 cpu too dirty