Many varieties keep producing more pods if you keep picking them as they grow in size. You can use biggest, yet still immature pods and use them with all kind of cooking. Keep doing this and your overall harvest will be much better! Especially Capsicum baccatum chilis are excellent with staggered harvesting. click the link below to find suitable varieties for this.
Ideally, you should grow a large plant with a bit more nitrogen. Go carefully tho as too much nitrogen can cause a lot of leaves and not much yield. When the plants get bigger, switch to more potassium heavy nutrient ratios. Usually phosphorous is very important for flowering stage but chilis don't react as much to phosphorous as many might think. Click the link below to get ideal nutrients for growing chilis first to large plants and then produce a lot of yield. These nutrients are available to buy In Europe.
As a rule of thumb, the bigger fruits the plant has, the bigger pot you should use. also, if the actual plant is large, a bigger pot will help. Pots overall are great when growing chili peppers as you can move them around. As they keep growing, you can place the shortest plants on the sunny side so others won't cast a shadow over them.
When exposing your chili pepper plants to direct sun for the first time, use pieces of lace-cloth or a lace tent (or netting) to protect the plants from a shock. This also smooths out the cold and hot peaks at first. Even couple of layers of lace cloth is a good idea.
It's very cheap, it doesn't have any negative effects and your plants won't get stunted or slow down the growth after the shock. Leave the cloth for a couple of weeks and then take it off. If you use several layers. remove then progressively.
This is something I HIGHLY recommend.