Thanks, I've not! But given the battery mass fraction is 53% for this build, rule of thumb is about 30% of a VTOL's weight for battery if you want to include payload. So I could just use a smaller 6S battery.

Or I could probably add another ~0.5 lbs or a little more without issue. The lifting motors hover at 45% ish throttle so there is some headroom for more payload without reducing battery mass fraction.