I just need someone to have a look at this grow an...

I'll start with things that are on point so you continue to maintain. Your temperature and RH is on point for the Veg. phase Once you move into flower you'll want to gradually drop your RH from 55% to 50% and aim to finish at 40% if you can. Humidity is the hardest thing to control when talking about reducing the RH% and not increasing the temperature in your tent. Secondly, you are giving the plant all the essential nutrients for the time-being minus minerals which is starting to show signs on depletion as your leaves are pale between the veins almost to the point turning yellow and next you'll see brown spots. Just as LaBOSS mentioned Cal-Mag will solve that issue and up to this point you had plenty in your soil but after 11 weeks it's possible it's being diluted and now showing signs of deficiencies. Focus on your watering, what I mean by that is you need to have a proper wet/dry cycle as this will be ever more so important when you are producing buds since any damage to your root system will make it that much harder for your plants to absorb the potassium and phosphorous required for big buds. Other than that be ready for a stretch with your plants. Stakes or a net will help support he buds. I see you have it already setup but I find it best effective when you let the plant started to stretch and in week 1-2 of flower and then start using the net for its true purpose or add a second net. In week 3 of flower I would do a nice defoliation and lollipop as the suckers below the net. Just a few things for now to focus on and we are all here for support should you have further questions. Every grow is a learning experience even for the most experienced growers. Cheers.