I may not be the right guy to help you. I work from inspiration. I'm not formally trained. So, looking at that circuit diagram leaves my head in a spin.
I'm a tinkerer and a bumbler. I stumble my way through not knowing what I've done until after I have done it.
How familiar are you with other simulators, such as:
LTSpice or
Micro Cap? I try to be a little proficient at using more than merely one simulator so as to be able to compare results from among them all. It helps me size up the situation.
Wavenology is another simulator which comes to mind....