why donta ya flush the medium and start off slowly with diluted veg nutes - you really need to be careful with ferts at the beginning - i feed only once in veg
call me naive but i can't see the point of removing light receiving leaves so that other leaves can get light? One would have thought the plan can deal with this situation naturally, or one could always resort to LST as someone mentioned.
The exception is if its blocking light from a bud.
A DR80 isnt really suitable for 400w unless you have an air cooled reflecter or a cooltube - I used a 400w with a normal reflecter and the temp shot up to 40c(100F) and beyond. Getting a cooltube solved this problem. I guess it would be even worse with a 600w.
If you are going to lower watts...