I use more power in Lyra because I use higher Vcore and higher memory frequency.
You use less power in Lyra because you use lower Vcore and lower core frequency.
So maybe Lyra uses similar power as Neo.

so plz try different config to get max speed and less power, may be your problem in catalyst and OS driver version, or mem/core ratio and other setting like intensity, worksize. We tried trix,giga,ref 79xx,asus,pcs,msi and among them run stable at undervolt and high speed
dont worry maybe in the next few days you'll be able to get better results.
My Lyra hash rate is 7900kH/s with 950W power consumption, or 8.3kH/J. My Neoscrypt hash rate is 2000kH/s with 870W power or 2.3 kH/J. Is your efficiency better than that?
I also run XMR cpu mining with that rig, using 3 threads of 3770k. The power consumption includes cpu mining, which is about 30W.