I doubt cortisol had anything much to do with it. Lack of sleep is lack of sleep. As is tiredness.
Re: SD - I would stick to 9 days. After 9 your strength levels start to wane, which is fine for a vanilla cycle but jumping into 5RM range doing 12 rep count clustering wants strength more than it wants a 14 day SD. You won't need to decondition down to the 10s, so to speak. 9 is plenty.
Just remember not to try and cut during an SD. So many ppl make this mistake and wonder why they don't progress across cycles.
Re: SD - I would stick to 9 days. After 9 your strength levels start to wane, which is fine for a vanilla cycle but jumping into 5RM range doing 12 rep count clustering wants strength more than it wants a 14 day SD. You won't need to decondition down to the 10s, so to speak. 9 is plenty.
Just remember not to try and cut during an SD. So many ppl make this mistake and wonder why they don't progress across cycles.