I love it when an intelligent grower shares his handiwork for us to marvel at.
With that being said, I must confess that I too am an avid reader of those willing to put their technical growing skills on display (i.e. GreenMonster714 + others). What I found is that with SOG (Sea of Green) the benchmark (for horizontal only) grows is approximately 1 oz. per square foot....and that for SCROG (horizontal only) that benchmark is set at 2 oz. per square foot (with the true pros...i.e. those in tune with both THEIR particular system of growing AND the strain they know and love so well...that number can increase to beyond 2.5 oz per sq. ft.).
While I find this grow impressive, I'm aware that this grower has yet to reach the 2 oz. per sq. ft. benchmark set by those growers who have come before us. (Look up "Yield-O-Rama" on the world wide web for an in depth background on growing the MOST while using the LEAST).
*But, 1.867 oz. per square foot (with a 150w bulb) is a GREAT yield...congrats! (counting the weight of the popcorn buds)
Armchair quarterback-type suggestions for improvement:
1. Do what you were already going to do...flush for only 2 weeks instead of a month (but I'll bet they taste great! with that long flush)
2. Manage your canopy better...attempt a scrog where each of your 2x2 scrog opening has a bud site in it...LST or SuperCrop stretching budsites (after going to flower) beneath the screen, in an attempt to keep the canopy with all the tops at about the same height (thereby getting the most out of your light...by being able to keep it close to the canopy without burning the tips of the "strechters")
3. Stick with one strain...use flowering clones (for superior branching and therefore bud sites)...and test individual grow parameter changes for incremental improvement.
Anyway, you probably already know all this...have fun and enjoy!
PS I'll document my first Scrog grow and share when it's complete.
Idea: 150w HPS grow / Operable clam-shell, vertical, elliptical-cylinder scrog grow
Goal: 1 POUND from a "horizontally" measured (4) four square feet!