your using a 600 watt HID right?plus cannabis specific nutes?2 oz per plant seems a little low to be shooting for i reckon,i use 400 watts and never veg more than 4 weeks,use orchid feed for veg and african violet feed and cactus feed for flowering and the odd mollasses,no fancy nutes designed for cannabis,no bloom boosters,yet average 4 oz per plant(had 6 from one),you should maybe set your sights just a little higher,i mean i'd be pretty disappointed with 2 oz per plant if i'm honest,and i'm no expert