I have 20-odd chili plants (capsicum frutescens) indoors. Planted seeds last year around June. I think initially the plants were struggling with humidity, so I started spraying water in the air daily (I noticed a big jump in growth after that). I water the pots once the top of the soil gets dry (I dig a bit with my fingers to check soil humidity in case it's still damp). I'm not using any nutrients (most of the soil I use has N 160 mg/kg, P 220 mg/kg, K 550 mg/kg, humidity 35%)
Here's the thing, flower bulbs are growing on 50% of the plants, but once the flowers bloom, they last a few days open, they slowly start closing and then they wilt away and die (it's not just a few, it's all of the flowers I've had so far). I am manually pollinating them every 1-2 days.
Any insight? I've read that flowers wilting can be due to poor humidity, watering patterns, lack of nutrients... I'm a bit lost on what to look into next. Maybe I'll add pebbles at the bottom of every pot for drainage (used terracota pots with a plate underneath before in about 50% of the plants, but the growth was worse than with metallic pots, so I switched them all to the latter).
Here's a gallery of 3 of my chilis: https://imgur.com/a/ub0W512 (if it helps diagnose the problem, I can take pics of all plants and post them)