Assuming little or no current on such a lake, those do look like rather wide angles! Unfortunately the GPS track includes effects of leeway and current, so it's difficult to analyze without being on the boat.
Hey Sandy - In one of the tracks shown, I was flying a class jib, in the other a 150. No, I've never been sure if I had the cars set right. I gather you move them forward for light air, aft for heavy, but that's about all. And despite a lot of jockeying the cars fore and aft, I never really perceived a dramatic change in the sail shape.What size jib do you have? Are you sure your jibsheet leads are set correctly?