68 days veg, exactly why I grow autoflowers. Still, good things come to those who wait! I'm sure you'll end up with lots of nice bud.
Don't rule out autoflowers under your cmh, they go together so well. Some say they finish even faster under cmh. These are going to be chopped on day 56 from seed.
These are day 36 from seed under the 3100k agro lamp + 4200k daylight lamp
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Northern lights is a really nice strain. Good choice. If I were you I'd either: Set up a separate mother tent, or... set up another flowering tent. Invest now and it'll pay off a treat. Clones look great, they deserve their own space. That scrog is going to fill that area. Even if you want to grow scrog next time. Get a set up and start vegging the new scrog.
Also if the node spacing is too close, just back the light off a bit, until you get the desired amount of stretch.