hi buddy you can always upgrade your extractor and intake fans this will increase the air flow also you could add more air movement fans also if placed at the bottom of the tent this will help suck out the warm air :) your right with the defoiliation in the first few weeks of flower i dont do it cause it can cause undue stress which can result in herms. you can always lst the plants when they strect try spreading them out with a net :) this will improve airflow too :)