As this is "my" thread, I dare to clutter it up with a reply:
Awesome, thanks for the video and your thoughts on circle tow! It was a nice read.
When you feel the air is not good when you have your go in speed, you can either wait for a minute or so ( and risk misjudging the conditions) or make a test launch to feel the air (with the hassles of a relaunch, expiring working time). But having the plane on tow for some time to fish for a thermal/good air is an intriguing idea!
Further weaving left to right several times on launch is also an efficient way to keep others away from launching (duration, distance)