I have a pheno (or whatever) of HSO GC fem.
It's very skunky, dark green, and it purples at the end, about 7 1/2 weeks. Extremely sensitive to light leaks. It's also very potent!
I figured all these characteristics were recessive skunk traits, as this seed is supposedly an S1 of the classic GC clone that's been passed around the SF Bay area for ages. Other phenos were very much like that classic GC, huge, fruity-mango smelling buds, branches that flop over from the weight, light green, 8-9 weeks (it looks done at 8, but it's not REALLY done til 9.)
Anyway, is it possible that you have a cut of another one of these skunky, purple pheno types, from HSO seed? Mine doesn't make golf balls, more like donkey dongs. But your description sounds a lot like the one I've got.