No need to spray plants unless they have issues and foliar feeding is the last resort.
You are trying to keep the rh down and your spraying water around the joint all day.
No he's not saying that ,just wait until the clones take hold in the soil and dont feed them or water them (unless dry) . You cant just start adding shit for a quick fix, the soil would have easily enough nutes for now as the clones haven't eaten yet.
When your losing shade leaves too early it affects the final weight. At this stage it usually happens after overfeeding, nute burn ,salt build up in pots etc , it could have happened slowly in veg stage . Stop spraying them and next grow back the nutes off a little and dont let the pots dry too...