And here we have DB developer again asking the DBA for help with tuning the application... is that just a deja-vu or a hickup in the Matrix? 
Jokes aside, before asking for "configuration parameters' it's absolutely necessary to understand what is consuming time in your code.
If you cannot see it in Plan Viz chances are that you are not using it correctly - which wouldn't be your fault given that there is no training or tutorial documentation available for just that.
So why don't you go ahead and share the PlanViz files and your stored proc. code so that we can have a look at what's going on?