Finally got over 60k
When I was using Pulchra instead of QY I was getting 10k points less, not sure why guides recommend Pulchra as YX's 2nd best option after Trigger. QY's multiplier buff is a big deal when you do so much damage during stun.
But you have to think a bit about dividing the field time between XY and QY to make sure you can do both ults during every stun.