My cc_config looks like this
There is one or two projects I had an issue with tasks not uploading and had to use the http line
Use all GPUs line is when there are 2 GPUs and both are not crunching, especially when they are different, if I remember right.
I use it on all the boxes, avoid issues and don't have to trouble shoot issues it can fix. Can't hurt.
 
 
<cc_config>
   <options>
       <report_results_immediately>1</report_results_immediately>
       <use_all_gpus>1</use_all_gpus>
       <http_1_0>1</http_1_0>
   </options>
</cc_config>

I am not going to bother with testing the NVIDIA Studio Driver 441.66 2019.12.10