if it were me sam and i use the same set up i'd veg 4 under your 600 and then flip them at about 2ft depending on strain and stretch, for example if were to do this with the heavy duty fruity i have i'd expect and get 4+ oz a plant with no training but other strains might not do so well as the hdf is a heavy yeilder, i also use 3gal pots and biobizz nutes with either biobizz soil or plagron light mix with a little extra perlite added, other than that mate i think without growing the strain you have or plan on growing there's not alot to add as every strain and pheno will be different and even the same cuts will perform differently in different set ups, training will most prob help aswell mate but i can't advise you on that as i don't have alot of experience just lots of experimenting and so far i prefer just tieing the tops down a little to promote side growth and then letting them do their thing i think again it's strain and preference dependant mate best of luck