I decided to leave them Veg until monday 8th. And flip them to flower that day to give time to the smallest one to develope better. Other than that they are healthy and happy. Today was the last defoliation, I left 3 nodes from the top and everything down was chopped. And I won't cut any more leaves (excluding the yellow leaves along the way),
@Lou_Grows, You're right. It was heat stress, I was pushing the plants as much as I could with a high light DLI and Co2, got very good fast growth around 28/29'C but started seeing stress up around 31/32'C so had to dial it back to 28/29'C.
I run a perpetual grow, the younger plants loved the higher temps but late flower ones didn't handle it well. In the end I've found that 27/28'C with 50-55% RH and Co2 is the best compromise for all the plants at different stages.