Boat was going so well.... don't want to offend you but the boat wasn't sailing at all well. In fact it was barely moving in a reasonable light breeze. If you'd had another boat out there with you, you'd of seen how poorly the boat was sailing re speed and handling. The mast looked like it was held up with spaghetti. I repeat, don't wish to offend. My guess you are new to this. Please have a look at two of my YouTube clips. I'm not saying they are fantastic but gives you an idea of how a boat should look and handle in light winds. Your boat did sail but could of been so much better and fun with just a minute spent fixing the mast. Then you could have started tuning the boat properly.

Voyager 1m Yacht -
www.youtube.com/watch

AU Class Yacht - 1.7m
www.youtube.com/watch

Once you tune your boat right you'll really have some fun. Should fly in winds just like those in your video. And make sure your mast is "tight". Sidestays should be like guitar strings! Jib tack just tight. Backstay loose. And make sure it is straight / perpendicular to the hull. Note: when you sail on a tack into the wind and the boat refuses to go to windward - try tilting the mast slightly forward. Loosen back stay, tighten jib sheet. That's "weather helm". If it keeps spinning into the wind do the opposite. "Lee helm". These are very slight adjustments and are basic tuning steps. Need to be done each time out to suit weather / wind. When correct boat should sail "hands off rudder" to windward and accelerate.

Look fwd to next video
Larry L.