Until you strip it for a rebuild I'd just tighten the cables you have, pull them from the back to take up any slack
I'm unsure as to why you have molex lines to your drives then adaptors, doesn't the HX series have Sata lines?
its just the adaptors really let you down looking all messy like that,
and when you rebuild Pm me and I'll tell you where to cut the holes to guide your frontpanel and other rearpanel cables better
Moto