@Peebos, I am not an expert myself but I did lots of research. Ofcourse pot size is important. But somewhere I read for auto flowering strains which are ready to harvest from seed in 8 weeks, they suggest smaller pots. I think your 18L is a bit overkill.
"the perfect pot size for auto flower plants should be 1,5 to 2,5 gallons (5,6 to 9,4 liters)"
I kept my pot at minimum because I may keep it as a stealth grow. This is my first proper grow but not the last. I will do massive grows in the future. But for this time I will keep things small, while trying to get the biggest buds possible. If I let the plant grow bigger, I will eventually have more buds, of course. But I can still get big buds in a small plant if I add more lights.
I think we will see it in the following weeks, keep yours in 18L if you want. And then we compare our harvests.
Best way to learn is through experience. Every forum or video etc. tells a different story. Although I believe this guy has good points: Search for growboss on youtube. Very educative videos.
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