Is it normal or at least acceptable if plants droop a littl the day after transitioning to flowering? I switched the light and shortened the growing cycle and today they are a little droopy. Thanks for any help or ideas.
thats probably fine. if all else is looking good, try giving them a boost with co2. you can find several simple ways to do that on this site. baking soda and vinegar is the simplest.
you don't need to boost co2. Next time just be more gentle and maybe add some root stimulator when you water right after the transplant. Make sure you always transplant IN THE DARK.
I always transplant in full light, and in 10 years of growing I've never had a problem. I think this idea of transplanting in the dark is a matter of personal preference.