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Makes sense, the blackjack seemed fine with the light intensity and had nice barrel shaped buds with the same feed and conditions.

I think @HydroKid239 may be right. I got foxtailing on one of two strains on my first grow with a new HLG 550 v2. I had the light at 100%, 18-22" away for second half of flower. 80-82 temp, RH in the 40's. I may try 70% ish for all of flower next grow, but I'm not sure. The photo with...

2mX1m is about 20 square feet and you want 30+ watts per sq' or a minimum of about 600 true watts to cover the space. The Mars TS1000 is listed at 100 watts so you'll need at least 6 of them to cover the space you have. You may be better off finding two LEDs of around 300 true watts each.

Sounds like ph and ppm are decent, maybe it is the start of a CA deficiency. Adding cal-mg may help There is a pretty good article by Canna Coco that talks about coco, CEC and deficiencies. https://www.cannagardening.com/problem_solving_coco

How's your PH? It would be good to know the EC or PPM too. I don't know your nutrient line but are they getting any Nitrogen? It's too early in the flowering stage to cut out N, IMO.

Sticky traps, gnatrol (any bti), I bottom fed every other watering. Try wacking your pots with one hand with a shop vac in the other. The gnats will fly when you wack the side of the pot, then suck them up with the vac.

Pots around 1', net at 2' above the pots, leaves you 2.5' for colas and lights. Maybe if you keep training outwards during the flower stretch. At some point you let the colas grow up past the net. If your colas are about 6" higher than the net that leaves you 2' so it will depend if you can run...

With a 5'6" ceiling, I'd keep the scrog net low. Roughly, one foot for the pots, one foot for the scrog net, two feet for light height comes to 4'. The other 1.5' is needed for the colas to grow above the net and some clearance between your light and ceiling so your light has some room for air...

Is it, sorry. I've heard you can top dress e.s. I'll watch and learn some more :)

You can sprinkle the top of your soil with the Epsom salts and water it in with your regular nutrient mix.

I've read that the larvae are ravenous but I'm not really sure if they eat more than the adults. Fortunately, I only have experience with lady bugs eating pests on outdoor landscape plants, I don't even want to know how well they work on indoor cannabis pests :)

Those jumping spiders are cool, never even heard of them. We learned what the the lady bug larvae looked like when we had dozens of them on an outdoor landscape plant. We thought the plant was going to be destroyed by some nasty pest but then googled it and realized those little guys were going...

OK, but these lady bug larvae are pretty cool looking and they can eat a lot of aphids fast.

You can spray them off with water and then bring in some ladybugs who will gobble the rest up.

Lights are a little close and might be causing the crinkled edges. As far as watering, make sure the pots are light weight before watering. Sometimes the top half of the soil is nice and dry but there is still plenty of water down lower. Those spots may be a calcium deficiency, try some cal-mag.

OK, sounds like you're ok there. How close is your light to the top of your plants?

F80M4 asked two important questions - What's your temp and RH, how far are your lights from the plant?

I'll comment on the window question and leave the controller stuff to others. Most basements are fairly cool unless your heating warms it up too much. You could pull fresh air in from outside your room and exhaust the warm air out the window. With LED you can run higher temps and maybe get away...

I don't know your nutrient brand but the doses seem high to me too. I would do what romeo suggests. Those dark green shiny leaves can mean too much Nitrogen.