i too was trying to do a al b style grow and found it worked well besides a few factors
1. al b told me to do zero veg (as i was vegging for 2 weeks) so i did a trial run and this is what i came up with
4 in front zero veg 3 in the back 2week veg went in at 10"
one of the topped main cola's
the 4 zero veg clones
when i vegged i wasnt eliminating enough branching so i was getting quite a bit of popcorn at the lower sites so i did 4 zero veg clones and 3 vegged clones and with the vegged plants i eliminated allot more of the lower branching than before and topped them in 2nd week of flower to keep them short ( my room is only 6' tall) then did the rest of trimming in week 4 and that was it and came out with some good results. the larger vegged plants had absolutely no popcorn and all colas where about the same in size and weight. vegged plants (3) where 2 oz's each for 6 total dry and the smaller (4) zero veg where 2 oz's for .5 each all together 1/2 pound so im going to veg and only do 8 per tray the same style i found worked with vegging so should be around 400-500 g per 4 weeks.
trimming is the way to go it improves everything.