I'm still learning so much every year. Onions seem to like the west sides of my raised beds, so this year they are all on the west sides. I put in 125, plan to thin out 50 over the summer, and should have 75 to over winter. We'll see. This years learn-the-hard-way lesson looks like it will be to use fairly new seeds. My whole row of beets is coming up very sporadically, and I used seeds that had been packed for 2018. I hate wasting space like this. Oh well.
I'm astonished by what you get out of your space. I've assumed you had quite a lot of land.
RE: Big House - Tiny Garden, in Upstate New York State, USA