I think you're OK here. I currently have a Northern Lights, Blue auto (delicious seeds) around day 72. This is the 2nd time I've grown this particular strain as an auto. Both times, a lot of yellowing in the fan leaves after 60 days or so, but that's all right. They've served their purpose and that just may be a characteristic of this particular strain. BTW, I use FFOF mixed with FF Happy Frog mixed with perlite as a medium, appx. equal portions of each. No additional nutes until flowers develop, usually somewhere around Day 30 to Day 40. Then I use the FF water soluble trio of flowering nutes (Open Sesame, Beastie Bloom, ChaChing) at about 1/2 strength of what I use outdoors.
The first time I grew this, I ended up waiting until the plant LOOKED FINISHED to harvest, instead of waiting for a desirable clear/cloudy/amber trich ratio. It went to 102 days before harvest. At that time, ALL the trichs were either clear or cloudy, none were amber. I've heard that some autos never develop amber trichs. This may be the case. At any rate, after a jar cure, the bud ended up being good. Nothing to write home about, but it does the trick. The delicious seeds Northern Lights Blue strain is touted as low smell. Great for growing indoors, but not a real sharp or distinct taste either.
FWIW, the conventional wisdom concerning autos is:
Don't transplant
Don't top
LST OK
ETA: Upon re-reading this, I didn't mean to make the post about me. Just relating my experience with the same strain as a way of giving you some peace of mind.
