I love whoops, but I found that the voltage was sagging too much on 1s 300Mah, so I thought, what if I make a 2s 65mm whoop! So I made it happen and here's the result.
25gr no battery weight.
No sag on 2s 300mah NBD gold packs with flights of about 3-4 mins.

Running Emuflight with the PMB tune and Throttle cap at 77%. I used BLHeli_M for the Escs and 96khz PWM signal.

EDIT: With Emuflight I managed to up the throttle cap at 80%. Here the test video: