That's more or less what I'd figured out, but I thought it would be good to double check. My class touched on the way the different sails would direct the boat, but didn't go into much detail. It was the Basic A / Mate course. I'll take the Advanced B / Master course when I've had a bit more harbor / local experience.
As to why I was sailing under Jib alone, I'd been playing with the the mainsail all day and wanted to experiment a bit
I don't have too many options for crew, so I'm pretty much forced to cat rig it for the time being. I will say that sailing under the jib alone is MUCH easier than wrestling with the mainsail!
Altogether a blast and an unforgettable experience.