Your aim was pretty bad and you mostly tried to evade by a harsh pitch up/down which shows more of your body.
Cannons can definitely rip a Nightbird apart but those are more effective against other jets when you're both looping - I've always found rockets to be better for whirlybirds since the flare recharge is fairly long
My aim is far from perfect but it's not as bad as you're suggesting - I can easily deal significant damage to aircraft other than dancing nightbirds with the 25mm (and even 30mm) cannon (despite using a controller to aim - no aim assist for vehicles). Even someone with insane aim like SILK mentioned a couple of times how hard it is to be effective vs nightbirds using the 25mm cannon alone. I'd like to to see you do significant damage to those dancing nightbirds with the 25mm.
I've tried different "evasive maneuvers" to highlight that the nightbird can deal considerable damage in all cases. In the very first clip, I didn't pitch up or down and yet the nightbird dealt 95% damage to my jet. If you just fly straight in an attempt to limit the exposed surface area of your jet, the nightbird can simply quickly gain some altitude to counter this (more of jet's surface exposed again).
