Gminer is faster than Bminer on grincuckaroo29 with 1080 Ti
I have 5x 1080 Ti, overclocked 75%/+150/+500
NVIDIA driver: 417.71

This is the result:
![image](https://user-images.githubusercontent.com/1230402/52852093-fbcc7480-3117-11e9-932b-683da18e94ee.png)

So, in my case, your statement is not true that Gminer...
> fastest on 20 series, Bminer faster on 10series

Maybe removing the `-nofee` option? Because we probably lose more hashrate:
> -nofee Disable the devfee but it also disables some optimizations.