With 1.6.3 the same situation as with 1.6.2... On cn-v7 RX 580 8Gb max speed is 1000 h/s on intensity 108, but not every launch. Miner needs to several starts to get this speed. Waiting up to 5 minutes not helps. Mostly speed is 985 h/s. On 1.6.0 speed is up to 1035-1040 h/s with intensity 116-117.
On v7 all of my cards , 470, 480, 570, 580 4gb or 8gb they all get the same speed on every launch, this is how it was in earlier versions too, only heavy had this 'have to run multiple times' to get max speed thing.
I changed almost everything in this kernel like it was in 1.6.0 for Rx cards, also nothing that has impact on intensity setting has been changed since, i don't know last 10 versions, so if 116 was a good value in 1.6.0 it should be a good value now too, i don't understand how can't you set it to 116 as before.
I also used the fragment value you wrote earlier here as a default for 580 8gb, you said you get the best results with it.
For me it's interesting that on a few xfx 580 8gb i have, even not on the same rigs, i can use the same settings on v.1.6.2 as before , and get the same hashrate as before. But i havent changed or tried out new drivers or anything on these rigs, cause they are mining rigs, the most important is that they run always stable, so i stick to a driver that is proven to be good/stable.
Win 7 or Win10, doesn't matter, blockchain drivers installed from day 1.
So i basically just upload a new version of miner when testing to the rig, copy the old config files and run the miner.
This way using absolutely everything same i can know if something is better/worse.
But kernel files didn't work from 1.6.0 on 1.6.3 - this means that you deleted them... Maybe something wrong with kernels builded by 1.6.2... I didn't deleted them...
For me the fact is - 1.6.0 running with 117 intensity gives 1040 h/s, 1.6.3 with the same config gives less. Now will try to delete srb files and compile new ones...
EDIT: Problem solved by rebuilding kernel files on 1.6.3. Now speed is the same as on 1.6.0.