4 weeks in how are they doing

This is my 1800w hps grow in a 2.4mx1.2m tent I have 9 big Buddha cheese x cheese they were begged for 4 ish weeks and are now 4 weeks into flower 5 seem a week or so forward and a lot more indica a the 4 biggest plants are a week or so behind everything seems ok so far around 4 weeks left would 2-2.5 oz off this size of plant be to much to ask there around 1.5ft tall and 2ft wide some bigger I know the right amount of light is there but think I should of vegged longer and input welcome thanks
All I am using nutrient wise is an oh perfect , cal mag and pk13/14

 

Cheers guys happy with them so far hopefully they pack on some weight