How do my buds look for day 31?

This is my first legit grow and i just wanted to know how my buds look size wise and for being on day 31 of flower. I have 4 1,000 watt lights with 36 plants all together. 18 abusive OG (7-8 weeker) and 18 NY sour diesel (8-10 weeker). the first two pics are of OG and the second 2 are SD. I just up'ed the PPMs to 1300 for week 5 and planning on going to 1400 from week 6 till the end. i also just got a CO2 s system and im thinking about also feeding them with that untill the end even though its nearly at the end. Again they are at day 31, 1300 ppms, PH6-6.1, temp. is 75-78 and humidity is 50-55%... no CO2 yet.

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i only have 3 complete grows under my belt but looks to me as you have done your homework.I love the amount of information at our fingertips these days.Amazing job you have a gift my friend.