Just tried release34 for my GTX 970 @1500/7000. No change to previous releases at pools with vardiff.

However, mining at pool with low dificulty leads to hashspikes when shares are found quickly. So the hashrate is still at 8.5 MH, but occasionally spiking up to 10.9 MH, which leads to an average of about 8.8 MH. I guess this release is best for heavily overclocked GTX 980 cards mining at a pool with the lowest possible difficulty. Good luck with testing everyone.

Edit: Values for X11 algo