Suppressing intermediate steps in multi step script

I am running a hosted version of webpagetest by submitting scripted multiple requests via API. Using logData to not capture unwanted steps and land on the correct page. XML and CSV ( I don’t use HAR file) capture correct data for destined page. Waterfall on the webpagetest looks good. However, when I view video or film strip, I can see the slides from the entire chain of event. Visually Complete graph also reflects that and since SpeedIndex is dependent on Visual Complete, it completely throws it off. So, my question is, can I trust the results of my test, specifically the SpeedIndex? Any help is appreciated.