You really actually have to get lucky. Mainly with the rotation of the blasters. The orbs get in the way if you dont get a good rotation. The best ones and most managable are when the blasters are at the top.. well for me. And i dont go to far away from the orb so i have space to move outwards... this all may not help at all but yeah!
I actually managed to get the secret ending on stream! I've mastered that attack cus of some info I got from this thread- apparently the orb doesn't just spawn randomly along the blaster's beam, it spawned in the position your soul was in when the blaster spawned in. That means it's better to stay to the edges of the box as much as possible.