The chainloader loads if you have more than two payloads in SD:/luma/payloads. Did you delete "godmode9-backup" from that location on your SD card?
Also: is there any specific reason you want this? There's not much reason to have a second version of godmode9 unless you need to fix the screen init bug (and if you're able to launch gm9, then it's presumably fixed on your console for whatever reason).