I was stuck at 392 for ages. I was a long time unsure what to optimize: my way to bring blocks up to holes, or my way to build up the required "first step" configuration? Maybe both?
Yesterday, to eliminate that doubt, I did a testing work on how I bring blocks to holes and understood there is nothing I can optimize there.
So I started to try to think differently my way to organize blocks at start. Today, I suddenly cut 2 steps... It was the confirmation I needed to invest further efforts on that and 10 minutes later: I won!
I would like to say an enormous thank you to Alazeh, who was able to help me clarifying my ideas, that without to spoil it for me. <3