can anyone give me some suggestion on my DIY?
your DWC looks to be interesting
it may work better to give the rooots a little less light
maybe cover your reservoir with aluminium sheeting
also the water droplets may do better with a little fertilizer formulated for soilless growing
if that is the objective
IMHO it is better [ for the novice grower ] to let plants grow in natural LIKE conditions {sun, soil, atmosphere }
and to observe what happens when and to learn basic growing strategy FIRST {and for the grower to learn PATIENCE }
before foraying off into the mad scientist role of planning to take over the world
with high tech { more complicated } grown super chillies
K.I.S.S. works and .......