What is the TH curve set to in that flight ?
Its way too low a head speed. The wagging you see is 100% head speed issue. On 6S you need to run it at 100% throttle or it will wobble.
Great flight though mate.
Yeah that sucks, chargers aren't cheap. Mentioned the pinion before I had read the whole post. Hopefully setting the throttle closer to 100% took care of the low head speed.
Hope your not sitting too long because of the charger.