How long are you in veg? What method are you using? Switch to a two month veg and get double your yield ! LSt method works really well to get more tops..,= more yield . Keep temps low and lights at a good distance; you will get yields your looking for . Also might wanna research the strain...
I would add another 600w for sure !!! If you have an inline fan and cool tube add a 1000w. Really 1lb per 600 is what a lot of people
Actually get ... Depending on method used and time in veg/strain.
Go with black gold !!! Black and orange bag, npk is zero... Going to be all organic and will be controlled by you!! Don't have to worry about burning your plants because of the spoil.
Have you sprayed with any kind of sulfer or fungicide ? This has been known to burn the crystals off the leaves and your buds. Also You need to add a pk booster such as snow storm by humboldt or beastie blooms by fox farm... Also there are some less expensive ones that work just as well by...