What works for me in Florida
My greenest healthiest hot pepper plants I grow under an oak with mostly
filtered indirect sunlight. I grow my peppers in a 15 gallon pot and give miracle
grow once a week. I currently don't have many peppers but the plants are green and
starting another round of flowering. I have a 3 year old C reaper, 2 tabascos, 1 fat
tabasco 1 wiri wiri, When a plant is really cranking like a Tabasco I might have 250+
peppers at once including red, orange and greens ones. I have also recently started
some more small ones.
They grow year round as long as I protect from the occasional frost
Have you tried miracle grow? drench the roots.