I'll try the new driver when i ot time to install it,

the rest of your suggestions is already done and tweaked.
intensity is lower for 2 cards that got obvious errors, the rest is running like a charm at 1932.
2 threads per cards is basic knowledge for anyone with vegas
affine_to_cpu 1 is set, and core 1 is removed from cpu.txt
i'm not even pushing the cards that hard, 920 MHz for 56 and 1000 for 64.
gpu mem temp at 55 C

Like i said, i had none of these problems mining xmr, only stellite communitypool thats giving me 25% less than i should get. sure, could be that the driver has been acting up since its very flaky. For now looks like i'm switching to xmr in order to evaluate. 25% is a lot!
i might try a different pool just see if its the pool or not...