Sounds to me like you’re doing everything right. The classic “stretch” doesn’t start until you go to 12/12 and lasts 2-3 weeks
As for the tight nodes, I think that is just a feature of growing under LEDs. I grow under LEDs and had the same scrog plan as you and I have had exactly the same experience as you (see my grow journal). The plants stayed short and squat and simply aren’t suitable for scrogging. Eventually I ran out of patience and switched over to 12/12. I don’t regret that decision although I was a little worried about yield initially. I may yet need the scrog net to support the buds later in the grow, at least I hope so anyway.
I think the answer may be to veg under CFLs/T5s and then flower under LEDs but to be honest things are going well enough that I probably won’t bother
I’m really interested to see what other more experience growers have to say on this subject