11 cycles this time. Went a bit further into the dizziness, since I was more prepared for it this time. Unsure whether it makes sense to just stay with the dizziness as long as I can, or whether I should stop earlier. Probably either is fine as long as I am somewhat confident about it?

Dizziness is certainly not the intended outcome; I don't get any. It's too much oxigen in your system. Ditto more shallow breathing.