Settings for Asus R280X DirectCU 2 TOP ?

[Starving_Marvin]

Before a mod deletes this post again. Yeah, I know there's plenty of threads of various 280X's but I'm looking specific settings for this particular model. A lot of conflicting info is around it and the some peoples settings seem very different than on normal 280X's.

I need help to get the most out of Asus R280X DirectCU 2 TOP -GPU. I've read that some people have gotten 800 kh/s easily. I'm getting around 735 kh/s, which is the same as with other R280's. But this is the overclocked TOP-model.

My settings for Cgminer:

setx GPU_MAX_ALLOC_PERCENT 65
setx GPU_USE_SYNC_OBJECTS 0
--scrypt -o stratum+tcp://xxx:xxx -u xxx -p xxx --thread-concurrency 8192 -g 2 -I 13 -w 256 --gpu-fan 55 --temp-cutoff 90 --temp-overheat 85 --gpu-memclock 1500 --gpu-engine 1070 --expiry 1 --scan-time 1 --queue 0 --no-submit-stale

Whenever I try to increase gpu memclock or gpu engine the kh/s is either the same or decreases. Even --gpu-engine 1160 --gpu-memclock 1800 --thread-concurrency 11200 with GPU_MAX_ALLOC_PERCENT 100 doesn't increase the Kh/s.

Any help appreciated.