Sonny, if you look at Ross's example of cable management, you'll see his doesn't have the cabling management holes w/grommets as most after market cases like yours and mine. Although Ross doesn't have those slots, if you look closely you can see how he really did a most excellent job re-routing the cables along side the 5.25 bay and tied off at the back of the case and a few of them are directly under the mobo itself.
So take advantage of those cabling slots and if it doesn't work one way try another....it didn't come to us on our first attempts at cable management. It took us a few tries and after we think we got, then look back and something else just pops out at you and you say to yourself " I should have run that cable this way". Although a modular PSU, like me and Ross has does make it easier for us.
Love to see a new pic of your cable management...the before and after if you will.