Foliar spraying getting on buds can be a concern. Can breed mold from inside buds. But I thought you mentioned it was an auto . If it is , and in 8 weeks , it should be near finish. Did you check bud triches. Autos are short lived : Grow , bloom , Finish.
I've finished autos at this time frame from seed.
It has at large center cola and minimal branching that is common.
Leaves will yellow because of the autos tendency to let you know its life cycle is near the end. I never bombard autos with nutes at final weeks. Just water. However there is some cupped leaves that be heat stress ( lights , temp or ? )
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