Guys, I have been trying to find a way to increase my hashing rate on my rx580 SE's, but it seems I cannot squeeze more than 0.864-0.865mh/s

Can anyone tell me if I should search for a different BIOS mode with different timings for this scrypt? I have bios modded my cards so that they would mine ETH with 31.5-32mh/s, but obviously that's not really helpful for this Neoscrypt algo. Also, if I try to increase the core clock speed to over 1250 the rig crashes and I start seeing screen disruptions and the miner freezes lul.
I have not tried it on any Rx 580s yet, but on Rx 480s it can do ~950 on stock settings and stock bios. Some GPUs are ~890, but others are over 1000. These are 8Gb models, but I don't think the amount of memory makes a difference.