Drawstringing?

I am in FF Happy Frog. I use FF trio very very lightly. I use Cal Mag. PH to around 6.5. PPM now about 300 when I feed. It was hot(80°f) and humid 60-80%. But now I am running the vent when the light is on 73-76°, 40-55%, for the last few days since I switched to 12-12. I did Azamax them last week, preventatively, I have had no visible pests. I misted them with plain spring water when I feed them 2 days ago. I just switched from RO to spring water with 120-150 ppm. They may have been a bit too dry before I watered. I do not over-water. They are in 3 gallon smart pots under a 200 actual watt Viparspectra Reflector Series. Always have a fan blowing. Any ideas what could be causing this drawstringing? I may be slightly underfeeding because I am afraid to over feed. But there is alot of drawstringing on my new growth that just started. All I can find that resembles this online is Tobacco Mosaic Virus But I live in a cooler northern state where tobacco doesn't even grow. Also I just topped them on Friday.
That is all the info I can think. Here are the pics. What do you think is causing this? Thanks for any advice.

Pic 1: the whole tent. They are a bit cramped but I don't want to defoliate because I feel the fan leaves are a buffer. Have had no signs of nitrogen deficiency either.

Pic 2 n 3: close ups of drawstringing leaves. This is happening on alot of my new growth on all of the plants. It just started. I am stumped and can find little info.

Maybe a ph issue? Either way, they look pretty good. I've had a few weird leaves like that on occasion. I would wait to see if it gets worse. It may very well straighten itself out.

cindysid said:

Maybe a ph issue? Either way, they look pretty good. I've had a few weird leaves like that on occasion. I would wait to see if it gets worse. It may very well straighten itself out.

Click to expand...

I always PH my water. I don't have a soil tester. Maybe I should try testing the runoff next time I water if it doesn't straighten out. I have heard Cal-mag can cause drawstringing, but I use Cal-Mag+, it is my most used nute combo. Thanks for the advice.

Im wondering if its just adjusting to new apical dominance since you just recently topped it. Was it doing this prior to topping? If its just new growth I wouldnt worry about it. Once it establishes what are now the new "tops" are it should straighten out.

It started doing it after I topped. I guess that could be. But, it is also doing it on some of the lower branch's new growth but not as bad. Thanks.