scrypt-jane and 280x

[claygraffix]

Hi, I can get 750KH/s on scrypt with my 3x ASUS 280x but with the same settings only 1950KH/s on scrypt-jane.  

Others are reporting close to 5000KH/s.

I would assume my same settings for one algo would work on the other, but I must be mistaken.  Seems like nothing I change can get it to break 2MH/s.

--lookup-gap 2 --thread-concurrency 11200 -g 2 -I 13 -w 256 --auto-fan --gpu-fan 30-75,30-75,30-75 --temp-cutoff 90,90,90 --temp-overheat 85.85 --temp-target 72,72,72 --gpu-memclock 1500,1500,1500 --gpu-engine 1080,1080,1080 --gpu-powertune -20,-20,-20

Any trick i'm missing?  Thanks.

[hero_phan]

hash chage depend coin and number of block.