The Lyra2v2 timings are depended on a good coreclock/memclock and boostclock (no trottle'ing)
The problem is when I mod a kernal to run fast on the 960, it might hurt the 970 performance.
When I mod a kernal to use more power, cards with little power will start to trottle.
The cryptomining blog has compared the 20 last sp-mod versions on the gtx 970:

Pallas Neoscrypt kernal was merged into release 59, but as you can see in the table above the hashrate is down.. This is not correct for many cards. I verified that my gigabyte g1 970 was up 10%
And the hashrate was around 580KH/s (Release 66 does gives 550KH/s) wich is closer to what I am getting.