Heya Capn. First let me say it's an honor to have you in my thread. I didn't get a chance to say that before I'm definitely a huge fan.
You do realize these are autoflowers? they don't like to be topped or chopped
My next grow is going to be modeled off your setup with the 5 gal buckets and separate res. Hopefully I'll have a better light as well.
So sorry, WC, your thread subject clearly states auto flower. I wasn't paying attention and haven't had my coffee yet today
In that case, to answer your question, yes, I would start to transition now! Good luck and I'm looking forward to seeing them go. You will be surprised what that 400 will do, especially with no glass in front of it.