Your Lemon looks good man. Always try new Mothodes if you have more plants and journal them. I got some more experience with growing some food more my self and know it's much easier for me to understand the behavior from the plants.
The perfect pot sizes would be something like that: 300ml --> 3l --> 9 or 11l --> 20-30l , every time mykorizza than you can better have control of your roots.
Keep growing boi :)
@peterkleber7, thanks man that reassured me alot. I'm defo getting some mycorizza and I will keep documenting & learning from you guys man. Thanks again π€πΌ