Finally got the oven spring after 1 year

The first time I felt proud of my loaves. Also this is the easiest recipe I have followed so it fits my lazy schedule also!

I use grant bakes recipe with some tweaks:
300g water
450g bread flour
100g starter
10g salt

Let sit 30 mins

Coil folds every 30 mins for the first 1.5hrs
Let bulk ferment (4 more hours at 23deg cel)
Preshape and let rest for 30 mins covered
Then shape, let rest in banneton for 10 mins before stitching. Leave on counter covered for 1 hour then transferred to fridge for minimum 8 hours uncovered.

Oven is preheated to 450 and the dutch oven is heated up for 30 mins after oven is done preheating.
I score then add 2 ice cubes and the boule is spritzed generously with water.

25 mins covered (incl 6 mins score) and 20 mins uncovered.

I find that the oven spring/ height is better when using a shorter length banneton since it wont settle lengthwise when cold retarding in the fridge.